#discrete math

138 messages · Page 1 of 1 (latest)

slim meadow
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yeah so for C you just need to find R such that R is reflexive, symmetric, and transitive

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essentially the idea should be to think "okay, R takes all elements of some subset of A, say B, to be equivalent"

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then you just have to define the equivalence relation accordingly

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and then part D is not too bad once you understand generating functions

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pretty good article on it here

fair grotto
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would that be the answer

slim meadow
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no, because 9R7 and 7R8 so therefore 9R8

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it should be the cartesian product of the equivalent subset

fair grotto
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would this be the answer?

IMG_3928.png
slim meadow
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so BxB

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No

fair grotto
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lord💀

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is the answer gnna be any sets?

slim meadow
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oh nvm yeah it is

fair grotto
slim meadow
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I think so

fair grotto
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so when im answering the question do i just type that out or say something infront of it

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like R prove AxA because….

slim meadow
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huh what

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no you just have to say the value of R

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and maybe if you want you can say more

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like show that R fits all the criteria of an equivalence relation

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and is not equal to AxA

fair grotto
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okayy thank uuu

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back to question D

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wud the first one in D2 be 9,9,9,9,9,9

slim meadow
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not quite

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you have an x in the numerator

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so a question for you is how does that expand to 9+9x+9x^2....

fair grotto
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LOL

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would it be 0,9,18,54

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and ii) 1,9,162,4374
iii)0,0,0,6,24,120,720

slim meadow
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you're right that the first term is zero

fair grotto
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omigoshh

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are yall not allowed to give out answers😭😭 im strugglinggg

slim meadow
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ok so what's 1/(1-x) expand to

fair grotto
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1111111111

slim meadow
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right, 1+1x+1x^2...

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now multiply both sides by 9x

fair grotto
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im lost😭

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9 and 18?

slim meadow
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1/(1-x)=1+x+x^2...

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so 9x/(1-x)=?

fair grotto
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9x+x+x^2+x^3

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WAIT

slim meadow
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mmm not quite

fair grotto
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9x+x^2+x^3

slim meadow
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so 9x(1+x+x^2...)=9x+9x^2+9x^3...

fair grotto
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so its 0, 9, 81, 729?

slim meadow
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no

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you just take the coefficient of each term

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0*1+9*x+9*x^2... gives us 0 9 9 ...

fair grotto
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so itll be be 0 then a bunch of nines

slim meadow
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yes

fair grotto
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hmm okok the second one would be 1, -9,-18

slim meadow
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I think you made a mistake though

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there shouldn't be any negatives in that one

fair grotto
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REALLY omg i thought i was hnna be wrong asfok

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so its 9,18,27

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would D2 iii) just be 00000

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no

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000100010001

slim meadow
slim meadow
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it's very similar to the first

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just start with 1 1 1 1

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and the x^3 makes you pad it out with 3 zeros

fair grotto
slim meadow
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👍

fair grotto
slim meadow
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no

fair grotto
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111101111011110

fair grotto
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@slim meadow is dis right

slim meadow
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you pad it out from the beginning

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it's 000111...

fair grotto
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when u say what the answers are i feel so dumb bc it was right in my face😭n it makes more sense

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OKAY but now its just the last 3 questions then im done foreverr😭😭

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just D1 iii-v

IMG_3906.png
fair grotto
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@slim meadow is iii x^4/(1-x)^2

slim meadow
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you got the numerator right

fair grotto
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x^4 +2 /(2-x)^2

slim meadow
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I lied

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you almost had the numerator right

fair grotto
slim meadow
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tbh you should watch a youtube video on generating functions

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I don't think you understand them at all

fair grotto
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the thing is i wont need to know abt generating functions after this test so idec if i fully understand it😭

slim meadow
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I watched this video several years avo

slim meadow
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yeah then learn it cuz you can't cheat on tests

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silly goose

fair grotto
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LMAO

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i litterally can tho cuz i have like 12 hours left to submit it

slim meadow
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then uhh maybe you should drop out of college and join the military

fair grotto
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LMAO WHATTT

slim meadow
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like

fair grotto
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how does that even correlate

slim meadow
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these are easy problems

fair grotto
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sigh

slim meadow
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and you can't do them without cheating

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you come in here asking for help

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so I oblige

fair grotto
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technically not cheating, its getting help🥱

slim meadow
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didn't realize you just wanted to cheat

slim meadow
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they'd love to help you

fair grotto
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THAT DOESNT MAKE ANY SENSE

slim meadow
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maybe they can teach you something you can understand

fair grotto
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i understand all my other classes

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sooo nice try

slim meadow
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if you can't comprehend a moral code, hopefully you can understand chain of command

fair grotto
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no ty🥱

slim meadow
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I'm not gonna help you cheat sorry pal

fair grotto
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bruh what😭

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its computing

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computer science

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NICE TRY

slim meadow
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oh my god web dev wow so impressive

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most computer science degrees are indian hogwash

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😆

fair grotto
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omg the typical maths major tryna drag me for not being good a math

fair grotto
slim meadow
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I've been programming for 8 years

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and most cs degrees are cringe for that too

fair grotto
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what type job do u have

slim meadow
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I should know, double majoring in cs

fair grotto
slim meadow
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anyway, I'm out. good luck cheating on your test