um

[inner yacht]

i'll be angry if u get wrong

[brittle lichen]

chil

chil

2x15y-2x480

[inner yacht]

so what is the final ans

[brittle lichen]

its 100% korect

uhuhuh

oh

[inner yacht]

hmm idk, u tell me

[brittle lichen]

30y-1060

[inner yacht]

huhuhuhuh

[brittle lichen]

2x15y-1060

[inner yacht]

-480x2 is -1060 or -960?

[brittle lichen]

960

[inner yacht]

yes

so fix that error

[brittle lichen]

2x15y-2x480
= 30y-960

[inner yacht]

COOLLL

• 2

[brittle lichen]

genius

[inner yacht]

braincell

now u have ur equation as $\frac{30y-960}{15}+16=y$

[alpine siren]

cantor

[inner yacht]

now bring that 16 on y's side

what do u get

[brittle lichen]

o uh

30y-960/15 = y-16

[inner yacht]

correctt!!

now u tell me what shld be the next step

think first

[brittle lichen]

o okay wait

[inner yacht]

when u need hint, i'll give one

[brittle lichen]

maybe move the 30y

to the y thats after the equal symbol

[inner yacht]

noo!

shld i give hint?

[brittle lichen]

let me thonk more first

[inner yacht]

okayy

stress those

cells

[brittle lichen]

find thsi part

[inner yacht]

yes, something is special about that part

[brittle lichen]

is it

960/15

[inner yacht]

(hint: look for multiplication or division and bring them across = )

[brittle lichen]

ooo

30y-960 = y-16x15

smart

then

i do the

y-16x15 part

but idk if bidmas applies

but theres no bracket so probly no

16x15 which is 240

[inner yacht]

it doesnt mean if there is no bracket then u wont multiply with every number

okay lemme help

so

u are correct on the

30y-960=15(y-16)

[brittle lichen]

o

wait

[inner yacht]

now do the multiplying thingiee i taught

[brittle lichen]

so whenever we mvoe the part

we must always put it behind the equal?

not behind the numbers?

like we cant put 15 behind 16?

[inner yacht]

i dont ger what u mean

[brittle lichen]

hmm like

[inner yacht]

OHH

wait u mean

15-y(16)

?

[brittle lichen]

i i mean

[inner yacht]

look

i'll explain

[brittle lichen]

this part is wrong bcz of

[inner yacht]

when u move a number from division on side across = it will mutiply with the entire thing present on the other side

[inner yacht]

because of? ur correct its wrong but tell me why its wrong

[brittle lichen]

because

15 needs to multiply both the number

i think

[inner yacht]

gooooddddd

[brittle lichen]

it will mutiply with the entire thing present on the other side

thiz

[inner yacht]

• 3 braincells

now

[brittle lichen]

[inner yacht]

u have 30y-960=15(y-16)

multiply the right hand side

[brittle lichen]

im expert on that!

15 x y-15x16
=15 x y-240

[inner yacht]

cool stuff

[brittle lichen]

o hwait

15y

[inner yacht]

now u have 30y-960=15y-240

[brittle lichen]

15y-240

[inner yacht]

im hoping u can simplify this on ur own

[brittle lichen]

ofc

[inner yacht]

doo it!!!

last step

[brittle lichen]

maybe

maybe

[inner yacht]

https://tenor.com/view/byuntear-incrives-meme-meme-react-gif-25029710

[brittle lichen]

*time to refer back *

[hexed ivy]

Which question are you working on

The age one?

[brittle lichen]

yez

(30y+15y)-240+960
=45y-1200

i remmebr theres similar up there

but but

icant find it back

[inner yacht]

nahahahhhaa

okay so

[hexed ivy]

You gon have to gimme a min to reread the chat

[inner yacht]

do it in parts

[brittle lichen]

like

[inner yacht]

30y-960=15y-240

first bring the 15y on 30y's side

remember what i told

the sign changes

[brittle lichen]

opposite

[inner yacht]

yess

[brittle lichen]

30y is um

subtraction at the part before the equal sign right

so after the equal sign

it becomes

minus

[inner yacht]

yess

[brittle lichen]

wait

no

what

really

[inner yacht]

so what do u get?

[brittle lichen]

o

30y-15y?

[inner yacht]

YES

[brittle lichen]

wait

[hexed ivy]

Yeah

30y-15y

[brittle lichen]

is the 30y before the equal sign

counted as subtraction or

addition

because theres no sign before the 30y

i mean it can be counted as positive igs

[inner yacht]

it doesnt matter if its before or after =, if one numbers hops from any side to other, its sign changes

[hexed ivy]

^

[inner yacht]

a number that has no sign next to it is +

[brittle lichen]

oh

oh

[inner yacht]

and negative ones have -

[brittle lichen]

so not used to these

i just learned the negative signs like

2 months ago

[inner yacht]

thats grade 3 math

or 4

or 5

idk

[brittle lichen]

what srsly?

cz we nver learnt those in elementary

only postivie all the way

[hexed ivy]

Yeah this is basic Algebra 😭

[inner yacht]

leave that, ur doing cool rn, solve and defeat the question

[hexed ivy]

Think of it like this 30y-960=15y-240 you wanna combine like terms so the 30y are 15y the same since they’re on opposite sides of the equation you wanna bring them on the same side

[brittle lichen]

big brai ntime

only learnt abt the opposite thing n the multiplicatio nway today

🤓

[inner yacht]

solve the question further before i deduct braincells

[brittle lichen]

wheres the question again

oh

oh

30y-15=15y

[hexed ivy]

No 🤦‍♂️

[brittle lichen]

then the other 960-240

waht

waht

[hexed ivy]

Your equation is 30y-960=15y-240

[brittle lichen]

yeahhhhh

[inner yacht]

thats correct

[inner yacht]

yes do that

[brittle lichen]

960-240=720

720/15=

[hexed ivy]

Yeah

Yes

[inner yacht]

YES

[brittle lichen]

48!!

[inner yacht]

YES

[hexed ivy]

There you go

[inner yacht]

mr tans age is 48

[hexed ivy]

^^

[brittle lichen]

so young

[inner yacht]

you now have solved a linear equation in 2 days and alot of typing

[hexed ivy]

LMAO

[brittle lichen]

i better make a summary

or a note

for this

before i forgets it

[inner yacht]

yeah maybe just make brief notes

i used to too

like

the sign changing thing

i used to say

[brittle lichen]

but before all those

i need to learn how to um

make equations from the questions

the statements

[inner yacht]

a bunny if jumps from one side it become a red bunny and vice versa

[brittle lichen]

so bascially

i need to make a note

fro everything

[inner yacht]

you'll have to understand the question on ur own

[brittle lichen]

cz i cant read statements

[inner yacht]

learn basic formulas

[brittle lichen]

im jst grade 7

[inner yacht]

and get a better grip on understanding word problems

[hexed ivy]

You from the U.S?

If your comfortable

[inner yacht]

and u shld be able to do that

[brittle lichen]

no what

[inner yacht]

😭😭dont do her like that

[brittle lichen]

the formulas i learned r elementarys one cz this is only the 3rd month of the school

[hexed ivy]

NOO IM JS ASKING A QUESTION 😭

[inner yacht]

thats okay, by formulas i meant like, average formula, the sign changing stuff, etc etc

[hexed ivy]

Cuz the education system is weird in the United States

[inner yacht]

yeah it is

[brittle lichen]

jst learnt the sign changing today

somewhere in asia

asean

[inner yacht]

didnt ur teacher teach u that before giving the hw

[hexed ivy]

^

[brittle lichen]

uhm

[inner yacht]

i am too

[brittle lichen]

thats outside tution

and and

[inner yacht]

so thats not from ur syllabus?

[hexed ivy]

Oh nah Im from the U.S 😭😭

[brittle lichen]

thats like add math 2.0

basically when u r grade 2 u have to learn grade 5

[hexed ivy]

Wait so what’re you learning currently?

[inner yacht]

😭 ur done fore

[hexed ivy]

Im in college bro shits tragic

[inner yacht]

but its easy

i mean being asian

is like

[brittle lichen]

um

[inner yacht]

having a maths bonus

[brittle lichen]

idk

i jst joined the tuition this week or last week idk

and they asked me to finish the homeworks

before the class starts

which is this friday

[hexed ivy]

Oh

So this is js like practice

[brittle lichen]

kinda yeah

[inner yacht]

anyway

[hexed ivy]

Whats your next one

[inner yacht]

ur going to solve the other questions as well?

[brittle lichen]

r those algebras?

if yes im gon try them

honestly idk what they r

[inner yacht]

being a teacher is tough

[brittle lichen]

😭 SORY

do u wnat a tip

[hexed ivy]

Its pretty much like Basic Algebra

[inner yacht]

naah, my back aches a lil

you shld try

the next questions

[brittle lichen]

i can give tip but not moeny

[inner yacht]

naah, idon want anything

are u crazy

[brittle lichen]

idk

i dont have moeny but i can make moeny

[hexed ivy]

What are your other questions?

[brittle lichen]

pins

[inner yacht]

a 7th grader is more financially stable than me

[brittle lichen]

yk the icon u r having as ur role

i can sell em for bobux

i mean

for money

bobux for money

then i can tip you lmao

[inner yacht]

i dont want money

or bobux

im fine

dont tip me

[brittle lichen]

im jst

[inner yacht]

and btw the second question

[brittle lichen]

yeah that i dont understand that

is it algebra

do we have to find p first

[inner yacht]

its more

number based

[brittle lichen]

ew i hate number

[inner yacht]

okay so

for the second question

just simply plug in prime numbers in the place of p

and simplify it

and see if they abide by the given set of rules

if no then false if yes then true

[hexed ivy]

Not me using Calc to solve these lol

[inner yacht]

1 is true

2 is false

3 is false

[brittle lichen]

Elp my um

Connection was dead

[inner yacht]

maybe use the money u have to buy wifi

[brittle lichen]

U mean test 1 by 1?

[brittle lichen]

I'm using wifi

[inner yacht]

1 is not a prime number

[brittle lichen]

For some reason it's not working for my PC but it's working well for my phone

I mwan

[inner yacht]

use different different prime numbers, plug them in the place of p and then see if its correct or not

[brittle lichen]

Test the number one by onw

[inner yacht]

test by 2 or maybe 3 or any prime number u like

[brittle lichen]

What if it's divided by a high number like 43746388

Does it matter w the method of plug in random prime numbers

[inner yacht]

well the answer wont change but it will be very complicated

• that no is not a prime

[inner yacht]

u can plug in whichever prime number u like

[brittle lichen]

what if we plug in 2 and its divisible by 3 but when we plug in 5, its not divisible by 3

then I will be false?

[inner yacht]

it is divisible by 3 even when u plug in 5

look properly

lets plug in 5

that gives u 5(25-1)

that is 5x24

which is 120

120/3 is 40

so yes

thats true

[brittle lichen]

oh

honestly

i dont even understand the question

[inner yacht]

you know what

[brittle lichen]

is it like: from I-III we must put the same prime number

[inner yacht]

take a break

go play some roblox

or maybe rest

[brittle lichen]

im so not used to english maths 😭

[inner yacht]

its okay

take a break

we will discuss later

with fresh mind

[brittle lichen]

its almst 12am lmao

[inner yacht]

its 9;30pm

for me

anyway

sleep then

[brittle lichen]

ill do note

[inner yacht]

okiee

[hexed ivy]

Ill show you on paper when Im home

[brittle lichen]

o kool thanks

[hexed ivy]

Its simple ngl

[brittle lichen]

i played too many boblox and forgot ab this

[brittle lichen]

still need help except for Q1

[full cove]

ok

ill look into it

just to save

@brittle lichen

did u do modulo

[full cove]

thats not how u do it

thats one way to go but its not the best way

to correctly do it u need to use modulo

assuming the right way to do it is high level

u can do this

holon

b. (7p-1)(7p+1) lets plug in 1; 6 x 8= 48
48 is not divisible by 7
c. (p+5)(p+7)(p+9) = p^3+21p^2+143p+315 ; p isn't divisible by 8, 315 none of the terms contribute to a factor of 8
or easily plug in 2, 7 x 9 x 11 = 693 which is not divisible by 8
therefore the correct answer is **a **since it is the last remaining

[full cove]

im not sure abt the 3rd question

but it should be

u take the last 2 digits of each number then multiply them together and get the last 2 digits of that,
13 x 21 x 29 x 37 x 45 x 53 = ........65 so the last 2 digits are 65
this is probably wrong dont take my word for it

[brittle lichen]

im grade 7

high level?

u mean hard or the other way around

[full cove]

hard

its with modulo

but nvm

just plug in should work

where r u from

these seem to be a lil harder

for grade 7

atleast here

[full cove]

the 3rd q is correct

i ran it through python

[brittle lichen]

asean

[brittle lichen]

wut

oh

[full cove]

thats the result of 2013x2021x2029x...x2053

[full cove]

here is how

and that is just the explanation

[brittle lichen]

wait

what if i got a large amount of numbers like

2013x2021x2029x...x2149

do i test it out one by one

or is there formula

[full cove]

the 2 last digits of that is

the last digits of 13x21x29....x49

[brittle lichen]

what if its a lot number to multiply

do i multiply it one by one...

[full cove]

no idea

its absurd they give u this without showing u how

[brittle lichen]

its kinda a practice test

[full cove]

mistake here

149

not 49

or wait lemme see

hmmmmmmm

i think theres a trick

[brittle lichen]

also i think this might be algebra related

they did gave me a list of formula

for algebra

and then the practice test

[full cove]

holon lemme do smt

[ornate pivot]

The last two digits of N is given by N mod 100

[full cove]

yes

hes 7th grade

[brittle lichen]

(a+b)^2 = a^2 + 2ab + b^2
(a-b)^2 = a^2 - 2ab + b^2
(a+b+c)^2 = a^2 + b^2 +c^2 + 2ab + 2bc + 2ca
(a+b)^3 = a^3 + 3a^2b + 3ab^2 + b^3
(a-b)^3 = a^3 - 3a^2b + 3ab^2 - b^3
a^2-b^2 = (a+b)(a-b)
a^3-b^3 = (a-b)(a^2+ab+b^2)
a^3+b^3 = (a+b)(a^2-ab+b^2)
1/n(n+1) = 1/n - 1/n+1
1/n(n+d) = (1/n - 1/n+d) x 1/d
1/n(n+1)(n+2) = [1/n(n+1) - 1/(n+1(n+2)]x1/2
1/1+2+3+...+n = 2/n(n+1)
m+n/m x n = 1/m + 1/n
1^2 + 2^2 + 3^2 + 4^2 + ... + n^2 = n(n+1)(2n+1)/6

the formulas i got

idk if itll apply to the questions

[full cove]

x = math.prod([2013, 2021, 2029, 2037, 2045, 2053, 2061, 2069, 2077, 2085, 2093, 2101, 2109, 2117, 2125, 2133, 2141, 2149])

k so

stay with me

[brittle lichen]

wa

[full cove]

theres a trick

[brittle lichen]

okay

magic trik

what trik do u wnat to do ✨

[full cove]

x = math.prod([13, 21, 29, 37, 45, 53, 61, 69, 77, 85, 93, 1, 9, 17, 25, 33, 41, 49])

[brittle lichen]

huh

yeah

[full cove]

last 2 digits of 2013x2021x2029x...x2149

ill explain

[brittle lichen]

butaint no way u r asking me to multiply them 1 by 1...

[full cove]

is same as

no wait

[brittle lichen]

ook

[full cove]

is same as 2013x2021x2029x.....x2093x2001x2009x...x2049

for 2 digits

because after 2 digits it wont affect

[brittle lichen]

oh

[full cove]

yes

and we said last 2 digits of the product

is the last 2 digits of the product of the last 2 digits of each number

so itd be

[brittle lichen]

huh

[full cove]

13x21x29x....x93x1x9x17x...x49

[brittle lichen]

c o n f u s e d

the last 2 digits of the product of the last 2 digits of each number

thats

a lot

to

i mean

[full cove]

no thats just me complicating words

[brittle lichen]

i dont understand that line

[full cove]

ill explain

[brittle lichen]

ook

[full cove]

last 2 digits of a product

is simply multiplying all the last 2 digits of each number

[brittle lichen]

yeahh

[full cove]

did u understand or u need more explanation?

u take the last 2 digits of each number then multiply them together and get the last 2 digits of that,

thats how u get the 2 last digits

[brittle lichen]

understand that

[full cove]

proof

[brittle lichen]

is that the explanation

[full cove]

see how all the last 2 digits

are 25

[brittle lichen]

cz i need another explanation

regarding

[full cove]

dam

[brittle lichen]

if im supposed to multiply this
13x21x29x....x93x1x9x17x...x49
one by one by writing it out..

or did i get what u said wrongly

[full cove]

yes...

thats it

ill look into another trick

[brittle lichen]

yey

[full cove]

im trying to find clues lol

hm that didnt work

ye thats it lol

i have no idea thats the most i can simplify

theres prob a way to do this

but ye

@brittle lichen

this is physics

relative speed

if im not mistaken

ill let u do this one cuz i explained how

[brittle lichen]

Oh I went to eat cakes and forgot ab this

88x99

Time to sleep 😴💤

[full cove]

yes and u take the last 2 digits of that

which is 12

gn

[inner yacht]

what

[inner yacht]

the

hell

[brittle lichen]

wut

[inner yacht]

what

[brittle lichen]

what

[inner yacht]

yes

[brittle lichen]

[inner yacht]

is ur doubt clear

and all the other questions

[brittle lichen]

he/she helped me w 3rd n 4th

but

but

they said i have to multiply the last 2 number one by one

which is um

i think theres a formula

no way im multiplying it one by one if this appears in a test..

[inner yacht]

you have to do it like that

didn't I teach you

tell me what is 2(x-10)

[brittle lichen]

uh

uh

2 x x - 2 x10

do i srsly have to multiply 13x21x29x....x93

might aswel as fail the test cz ill spend 30 mins there

(my multiplicatin is meh meh only)

[inner yacht]

what the hell

why do u have to do such a big multiplication

in which question?

[brittle lichen]

^

3rd

im told to multiply the last 2 number to find de answer

but imagine if theres a lot of numbers to multiply

[inner yacht]

no you don't have to multiply the "last 2 digits of the given numbers"

that's way too much time consuming

[brittle lichen]

what then

how

they said thats the method for a grade 7

[inner yacht]

so many msgs that I get lost while scrolling so I'm sending the question again

[brittle lichen]

its at pin lmao

[inner yacht]

I can't see the pins on phone

[brittle lichen]

oh

i think u need to click da search icon thingy

[inner yacht]

hmm okay well

Maybe u have

[full cove]

cantor

[inner yacht]

to

[full cove]

whats the method

[inner yacht]

do the multiplication thingy

[full cove]

idek the method myself

[inner yacht]

I tried with units

wait gimme a min

[full cove]

its confusing how theyre supposed to do this if they dont even know the methods

[full cove]

for this 1 example its not

especially with a calculator

13 * 21 * 29 * 37 * 45 * 53 =

[brittle lichen]

[inner yacht]

yeah and it's very extensive
like imagine the time it'll take to do js one question like that

[brittle lichen]

i cant use calculator

the paper said no calculator

[full cove]

maybe the reason its not that big is because its for 7th grade

[brittle lichen]

• i think ylal should treach me the method

[full cove]

welp shit

[brittle lichen]

bcz this is higher level

rmmerber the tuition is for, grade 2 learn grade 5/6 stufs

3/4 level higher

[full cove]

well dam

[brittle lichen]

[inner yacht]

well her multiplication is a bit low

so we need to

think of a method

[brittle lichen]

its low but i can do

jst

one by one

i might mess up thoguh

i learnt mental arithmetic by myself but only for 2 numbers

ok idk if thats what its called in enlgish but yh

[full cove]

whats the time for that exercice

[brittle lichen]

time?

wym

[full cove]

do they have a certain time for each exercice

like recommended

if not then nvm

but atleast the method i told u abt

works with the last question

:)

[brittle lichen]

nop its jst i actually have 1.5h to do the whole paper

[full cove]

easily

oh

99*88 = 8712

take last 2 digits of 8712

[brittle lichen]

25 questions in total

[full cove]

12

[brittle lichen]

theres 25 questions and i actually only know how to do 3 of them....

which some i google searched

bt i asked a few here

[full cove]

there might be a method with repeating last 2 digits

[brittle lichen]

welp ill jst stick to ur methd for now

i hv to submit it later so il jst explain this to her lmao

[full cove]

lateR?

oh its graded?

[brittle lichen]

not graded

to test my level

i mean theyll prob grade it or smt bt theyll discuss anyway

so when they discuss il have da method

[full cove]

nah its evaluation

it wont be graded

but one of the questions is physics

[brittle lichen]

the only thing i know ab physics is the triangle thingy

[full cove]

hm??

the question abt the speed is physics

[brittle lichen]

i only learn physics once in my elmentary school so

prob 1-3 times

bt i remmebr the trianlge thing only

and at my secondary school i havent learn anything ab physics yet

[full cove]

did u do the first q?

[brittle lichen]

yep

cantor taught me though

the 2nd

im stil unsure

the last one

ur method

the 3rd one ur method

others

idk

[full cove]

the 2nd one i did it

for u

[full cove]

.

i plugged in values that prove theyre not divisible

[brittle lichen]

oh oh idint see mb

[full cove]

so the answer would be a

[brittle lichen]

soo basically jst plug in numbers?

[inner yacht]

i found a method

its easy but difficult to explain

[brittle lichen]

y e y

where did u find it from

[full cove]

cantor

show

[inner yacht]

okay so lets take an example

[full cove]

im also interested

[inner yacht]

(im explaining)

[brittle lichen]

ok

[inner yacht]

oh and i might disappear in between so im very sorry in advance

Anyway

[brittle lichen]

ill jst thonk when u r gone

[inner yacht]

lets say we have 13×44×24×74

we have to find the last 2 digits

[brittle lichen]

ya

[inner yacht]

so first step is to divide by 100

13×44×24×74/100

u can reduce the 44 to 11 and the 100 becomes 25

[brittle lichen]

multiply then divide?

[inner yacht]

So u have 13×11×24×74/25

[brittle lichen]

oh oh

[inner yacht]

yes

[brittle lichen]

then why not jst multiply and find the last 2 digits from the answer

[full cove]

isnt that

more coplicated

💀

[brittle lichen]

extra steps

[full cove]

complicated

😭

[brittle lichen]

felt like dividing 100 is an extra step

[inner yacht]

keep in mind that you've reduced it by 4 times

[full cove]

just say mod 100 :)

[inner yacht]

yeah go ahead multiply it then

[full cove]

yes and u still need to multiply

THEN DEVIDE

[brittle lichen]

wait what if its one tht cant be

reduced

[inner yacht]

I NEVER SAID MULTIPLY U DUMBASS!

[brittle lichen]

moderator?

[inner yacht]

Did i multiply all the numbers??

NO

let me finish first

[full cove]

then

ok

thought that was it

[brittle lichen]

wait whats mod

[full cove]

modulo

[inner yacht]

yes so, we reduced it by 4

So we have 13×11×24×74/25

now the first number overe here is 13

check how many times less it is thsn 25

[brittle lichen]

uh uh

uh

12

[inner yacht]

Good

now do ths same for 11

how much

[brittle lichen]

14

[inner yacht]

good

now same for 24

[brittle lichen]

1

[inner yacht]

now for 74

[brittle lichen]

can it be negative

[inner yacht]

you have to find closest to 74 multiple of 25 such that it is greater than 75

so tell me

[brittle lichen]

wait is it the factorize thingy again

or lcm

[inner yacht]

is 75 a possible answer?

[inner yacht]

not at all

[brittle lichen]

no? its bigger than 75

i mean

25

wait im confused by the statment lmao

[inner yacht]

i said multiple and 75 is a multiple of 25

25×3=75

[brittle lichen]

oh

3

[inner yacht]

noo noo!

[brittle lichen]

c o n f u s e d

[inner yacht]

now how much less is 74 than 75

[brittle lichen]

1

[full cove]

im confused to 💀

too

[brittle lichen]

chill youll know soon lol

[inner yacht]

believe me this method is easy af and useful but confusing to explain

anyway

[brittle lichen]

s/he makes the impossible possible ✨

[full cove]

did u just find it or is it a known method

[inner yacht]

now multiply this 12, the 14, the 1 and the other 1

12×14×1×1

that is

168

[brittle lichen]

wow

[inner yacht]

@brittle lichen can u do this much multiplication

j m

[brittle lichen]

yeah

[inner yacht]

cool

[brittle lichen]

bt what if the question is bigger

[full cove]

ok so

[brittle lichen]

and making the final sth like this : 59x88x83

smt smiliar like that

big number

[full cove]

uh

whats the answer

[inner yacht]

then just do the how much time less than reduced value of 100's multiple

[full cove]

wait whats the answer lmfao

[brittle lichen]

what if its already reduced to the lowest possible

168

[full cove]

u want last 2 digits

68

is nt the answer

its 72 i think

[inner yacht]

lisyen first

[brittle lichen]

wut

[inner yacht]

we are dont yet

not*

[brittle lichen]

oh okay

[inner yacht]

now u remember how many times did we originally reduce the given numbers?

4 times reduced

[brittle lichen]

yeah

[inner yacht]

now multiple 168 with 4

[brittle lichen]

672

oh

[inner yacht]

those are ur last 3 digits

pretty confusing but it works

[full cove]

more than sure theres an actual method

[brittle lichen]

right so il jst make anotehr note for this

[full cove]

2013 2021 2029

is always n+8

[brittle lichen]

n is infinite right

[inner yacht]

yes a sequence

arithimetic sequence

[brittle lichen]

oh wait nvm

[inner yacht]

noooo, n is any natural number

😭why infinity ?

[full cove]

sequence is hs so ye

[brittle lichen]

my english teacher told me it means infinite 😭

[full cove]

what

no its a variable

[brittle lichen]

cz there was a question ab nth degree so

[full cove]

natural number

[inner yacht]

this becomes n, n+8, n+16

where a is n

[brittle lichen]

'madness to the nth degree'

[inner yacht]

and d is 8

[brittle lichen]

im confused by the amount of alphabets

[inner yacht]

☠️istg ur english teacher is cracked maybe

[brittle lichen]

a

n

d

she said that it meant the craziness is at an infinite degree

pov english teacher teaches maths

[full cove]

its n + 8k

[inner yacht]

she was on fentanyl, nth degree is not infinite degree

[inner yacht]

whay rhe fuck is k

whats k

[full cove]

k is the number of times we did the shit

in simple words

so n + 8*1

n+ 8 *2

n+8 *3

[brittle lichen]

okay so ill do question 5 by myself bt i need a nexplanation what the exclamation marks means....

[full cove]

that exclamation mark

isnt mathematically correct

[brittle lichen]

and question 6 is it algebra

[brittle lichen]

wait so the question is wrong?

[full cove]

the question is dumb not wrong

[brittle lichen]

oh

is it hard

[full cove]

wait

lemme check smt

normally !!

is double factorial

so ye the thing is wrong

[brittle lichen]

whats

factorial

wait so the question is wrong

whats double factorial

[full cove]

no the question defines n!!

so no the question is not wrong

[brittle lichen]

oh n is wrong?

[full cove]

no 😭

NORMALLY

without context

the question is wrong

but in this case its not

[brittle lichen]

ehh

u mean without the words

[full cove]

nvm it

[brittle lichen]

like just numbers

its wrong?

[full cove]

nvm it

forget what i said

[brittle lichen]

okay

[full cove]

lemme think

[brittle lichen]

btw is number 6 algebra

[full cove]

ye

i think

@brittle lichen

i think 7th grade maths harder than calculus frfrfr

[brittle lichen]

😭

what grade ru

[full cove]

11th

but i do higher grade stuff

[brittle lichen]

isnt grade 11 the highest

after that is collage or uni

[full cove]

no

here theres 12 and even 13

[brittle lichen]

wut

rly

[full cove]

yup

[brittle lichen]

11 is the highest in my country

[full cove]

11th is 16-17

12 17-18

[brittle lichen]

or atleast my school

[full cove]

13 18-19

[brittle lichen]

18 yo collage here in my coutry

[full cove]

k i need a pen and paper

[full cove]

@brittle lichen

ill have to say

last 2 digits are 01

or 1

theres only 1 digit

dont take my word for it its probably completely wronh

[brittle lichen]

rly rly

show

process

plz

[full cove]

welp

i messed up

fuck

i thiink i needa go back 7th grade

would u like to take me in <3

[brittle lichen]

gs what does this means

[brittle lichen]

answer is 1

the !! question

[full cove]

How did u find it

Cuz i messed up

[brittle lichen]

oh uh uh

il explain later

kinda in a rush rn

[full cove]

Oke

[brittle lichen]

but did u calculate it 1 by 1

[full cove]

What

💀

Itll take billions of years to calculate that

[brittle lichen]

meh

btw my teacher said that we learnt this during grade 3

🫠

[full cove]

I already answered this

[warm patrol]

Oh my, what a long thread. What are you discussing?

[full cove]

Check pins

[warm patrol]

Well, I see that, but which one are you discussing now?

[brittle lichen]

she says this

is better

[brittle lichen]

ik but grade 3 is wild

[warm patrol]

Yeah, that was also my approach.

[full cove]

eh

[warm patrol]

Woah... Hm.

[full cove]

88*99 take last digits of that

works too

[brittle lichen]

she syas its works too

but thats better way

idk but

yh

[full cove]

kk

[warm patrol]

Well, according to this definition, we have:
x!! = x^((x - 1)!!)
So:
(x + 1)!! - x!! = (x + 1)^(x!!) - x!!
Not sure how that helps, though. This probably requires some number theory, which I haven't learned.

[full cove]

i did same things

i also thought we define x!! by k and itd be

but thats a mistake by me

[full cove]

keep in mind shes in 7th grade

😭

[warm patrol]

Wait, hold up.

[full cove]

it would be 2020!! . 2021/2020^2020!!

[warm patrol]

Why is 4!! 4096? Shouldn't it be 4^3^2^1 = 262144?

Ohh.

They don't follow the usual convention of power towers, do they?

Well, in that case we just have n!! = n^((n - 1)!).

[brittle lichen]

i finaly understand !! meaning

[full cove]

LMFAO

WAIT

dont take that understanding

just do it for this exercice

cuz in reality its different

[warm patrol]

Yeah, they just made it up.

Double factorial is usually different.

[full cove]

ye

[brittle lichen]

dis

[warm patrol]

Well, yeah.

Though, again, they don't follow the usual power tower convention here.

So, the numbers are a lot smaller that you'd expect.

[full cove]

what i thought is

let 2020 = k

k!! x ((k+1)/k)^k!! -k

[warm patrol]

Yeah, not sure what to do here. I don't see any pattern in the general formula.

[full cove]

mb k-1!!

[brittle lichen]

she said

[full cove]

stay with me

[brittle lichen]

jst look at last digit aka
2021 !! - 2020 !!
last digit = 1 & 0
1-0 = 1

[warm patrol]

This requires either number theory, which is far above school level, or trial and error, which is uninteresting.

Wait, how do you know that they have those last digits?

By the definition they gave we have 2021!! = 2021^(2020!), 2020!! = 2020^(2019!).

[full cove]

i also said 1 but that with an equation that i did falsely

[warm patrol]

Oh, wait...

Yeah, that's true!

2021 to any power ends in a 1, 2020 to any power ends in a 0.

[full cove]

oh shit

[warm patrol]

So, 2021!! - 2020!! = 2021^(2020!) - 2020^(2019!) ends in a 1 - 0 = 1.

I see. This problem isn't about looking at the general case.

[full cove]

bro this isnt some 7th grade stuff

wtf

[warm patrol]

Nah, it's pretty easy.

[full cove]

kinna hard u may only see it after u know the answer

[warm patrol]

The general case is far more difficult, but this particular one is easy.

[full cove]

ye but u have to notice it

[warm patrol]

It's kinda silly that they made up their own definition of !! and didn't follow the usual power tower convention, though...

[full cove]

yo

do u have any formula that gives last 2 digits of 2013 x 2021 x 2029 x 2037 x 2045 x 2053

i found it but its just a lil long

[warm patrol]

Hm...

What's the pattern there? Arithmetic progression?

[brittle lichen]

they want last digit the questions say

[full cove]

cantor gave another formula he found which is a lil harder

[warm patrol]

Yeah, seems so.

[full cove]

+8

[warm patrol]

We've already solve it above.

[warm patrol]

Yeah, I see it.

[full cove]

u can write in a sequence

[brittle lichen]

oh oh

[full cove]

cantor got a formula but

[brittle lichen]

didtnt see mb

[full cove]

its a lil complicated maybe theres an easier way

[warm patrol]

Not sure, sorry.

[full cove]

its ok lol

[warm patrol]

While this is school material, this is still number theory-oriented.

I don't have much experience in that field.

[full cove]

isnt this physics

its like relative speed or smt

[warm patrol]

Yes.

Let's see.
Supoose the speed of the train is v, the speed and length of the truck are u and x and the time it took for it to go by is t. Then:
x = (v + u)t
Then you can find u.

At least, if I understood the problem correctly.

[full cove]

theyre 2 bodies moving in opposite directions

[warm patrol]

Yes, I get that.

[full cove]

the formula for that

is length 1 + length 2 / speed 1 + speed 2

and we can get the result of that

because we have the length and the time

the truck is stationary

i think

wait no

20m/s = length 1 + length 2 / speed 1 + speed 2

[brittle lichen]

answer is 2m/s

[full cove]

yes

ik

[brittle lichen]

but

i dont have the explanation

n i dont understand

[full cove]

its physics

but i already saw its 2

relative speed of opposite objects

[warm patrol]

Yes.

[full cove]

20 - 18

is 2