#help-4
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i dont know what the statment is even saying
where did shoe size come from
im confused
you're given extra info in part b: among your 25 women, 3 of them have shoe size 7.
Zoe says,
"The probability that a randomly selected woman from our group has shoe size 7 or dress size 14 is 3/25+6/25=9/25."
there is no dress size 7 tho
ok i read that wrong
yh
then she is not wrong
bc from the the table is 6/25+3/25 as she stated
which is 9/25
ok that's gonna be a nope
but what about the women who have both shoe size 7 and dress size 14?
they would be counted twice, no?
yh
but then you multiply bc is and
why would you multiply?
tfw memorized "and means multiply"...
why are we adding the fractions when it says or
but zoe says or so 1 of then condition need to be met
we are saying what about the people that have shoe size 7 and dress 14 zoe didnt say and
yes
and 6 + 3 = 9 people who do gymnastics
yes
so if the left circle = shoe size of 7 and right circle = dress size of 14
you can't just add both circles and call it a day
no
you'd be double counting
you'd have something like (5 + 6) + (6 + 3)
so what do you have to do to make sure the middle is only counted once?
u dont add
but lets just say you were given that 11 people play hockey, and 9 people do gymnastics, but 6 people do both
there's one easy step you can do after you add though
you want to have 5 + 6 + 3 here right?
then that would be all good
yep so after you add (5 + 6) + (6 + 3)
you just need to subtract 6
yes
you just need to subtract the middle (the intersection of both)
π
the point is we don't know how many people have both that dress size and shoe size
exactly
is 6
if the intersection has 0 people, then we can have 3/25 + 6/25 - 0/25 = 9/25, sure
but what happens if the intersection has 1 person?
2 people?
5 people?
yess
all 25 people??
we substract
yeah
them
so then it wouldn't be 9/25 right?
yh
it'd be something less than that, more specifically
but there might be people in the middle
that's my point
we dont know
so then Zoe's just wrong
how do i word this then
yh i get it now
"Zoe is incorrect; she didn't subtract the intersection"
yeah
ok
thats fine
yes thank you for your time
no worries!!
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which step do you think is invalid, if any?
theres a property
for inequalities
but turns out
don't call me "bro".
the first ones wrong
ah fuck
i didnt call you bro..
wrong reply
logarithms are monotonic
meaning always increasing or decreasing
perfect for inequality abuse
logarithmic functions with base between 0 and 1 are decreasing
to be more specific
so you would need to reverse the sign
@signal chasm still here?
but
it doesnt matter right
cos
well
the left side
gna equal to 2 or greater
.....
yes it does, the sign was supposed to be flipped but it wasn't, that was the mistake
how
how what.
if a > b\
then $log_{n} a > log_{n} b$, IF the base n is greater than 1
wait.
this is because in that range the logarithm is an increasing function
on the contrary if n is between 0 and 1
yes
which is
why ask that
yk the right hand side is gna be 6
at (1, 0)
and if its n=1 by any chance
that means x=2
so
both of these coordinates
are to the right
of 1,0
meaning a negative y
so that means
the sign should flip
when using the logs
is that logic correct?
um do you mean the n in the question?
oh yh im slow for that
yes
cos n has to be a positive integer
so the left hand side smallest value possible can be 2
both points must be on the right side of x intercept
meaning y value is negative
so the overall log value
is negative
so sign should switch right?
idk
if that makes sense
or not
can you say which log values youre stating negative here
ok
so
log 1/2 to the 1/4
=2 right
wait
im an idiot
i think
i confused myself
so that step is actually correct
the tomfoolery happens when you bring a logarithm on both sides
you know 1/4 < 1/2
but is $log_{1/2} 1/4 < log_{1/2} 1/2$?
what about this
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why are these the values for x
whats the original question?
gm
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0β€{x}β€1, so other values that don't fit in the domain don't enter in the sequence
you've opened this channel btw
remember to close it when you're done, unless you have a question
Sorry :p
How to close?
!done
If you are done with this channel, please mark your problem as solved by typing .close
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hi, need help finishing this need to make a drawing using various things on desmos trying to make a bear please help me finish it!!
thats so cute
this assignemnt is actaully pissing me off likec razy
u are asked to make this on desmos?
(btw you can add images in desmos for easier reference)
Ngl just use chatgpt
"He" is crazy π
Ohh
I personally use equations like $p_{0}=\left(p_{01},p_{02}\right)$
γ’γγ© (>β©<)
and i can move the points closer to the image
Alr alr
u need to make it up
let me share my sample
okay let me elaborate i have 0 knowledge of what i am doing!
i draw things like this https://www.desmos.com/calculator/ec00589750
just a sample π
once u do that u can hide the points when u make ur equation
okay but i have 0 idea on how to do that
theres not like an equation i can just copy and paste?
first try writing up 3 points

like this
ya
uh theres a yellow triangle
why is there an anime villain in my maths
-# and why is he looking at me like that 
for triangles i think u need to make coordinates like $A = (x_1, y_1), \quad B = (x_2, y_2), \quad C = (x_3, y_3)$?
I forgor
γ’γγ© (>β©<)
its a fanart π
idk about that
so how do i put that into desmois
also how di i make it so this parabola ends at a certain point?
something like this $y = x^2 {0 \leq x \leq 3}$ for example
γ’γγ© (>β©<)
i was trying something like this but it wouldnt worjk
u need to add {}
ohh
wheres the other side LOL
like i literally have no idea how these numbers work
if i dont do this today i get kicked out of college so im like tweaking out rn'
nosebleed
okay how do i get it lower LOL
γ’γγ© (>β©<)
no! i am not
u said to try that no?
ya u can play around with desmos until u get it π

ok am playing with some of the numbers how can i close that gap
can i get some like lines
just bring the numbers closer like change that -3 and -2.7 to something tighter like -3 and -2.9 and maybe let the x-values chill together more see if that works
also do u mind giving me ur thing i wanna test the triangles
here's how u could start with triangles
that looks like a quadratic bezier curve
a curve is a curve right 
i just need a c
a c where?
oh I thought you meant an actual c on the graph π
alr well then let's shoot for an A 
parabolas ftw
bruh
i just realized it needs to be a logo and not any drawing
omg im gonna cry
what logos have a bear π
make mcdonalds logo
wont fit the requirements
what r they
no cricles
I'd be dead by now
and get this!!!
if i dont do this plus 150 other questions of hw plus 5 more assignments with the same type of vibe i cant go to college !!
all due tonight btw.
bro
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heya. if i have this equation: x^3-x^2-3^(x-1)+4^(x-1)=0 , can I do anything with those simmilar powers?
i know common bases disappear when the exponents are the same when equating two terms, but i'm not sure if theres any of that magic i can pull here
it also looks to be a polynomial with a 3rd degree as the highest, and we've not done too many of those
It is NOT a polynomial
i need to find its roots by the way
hmm
This seems quite difficult on first inspection
okay i might have gone about it wrong
let me restart with the problem
i have to prove the continuity of a function on the R interval. the function takes two forms: x^2+3^(x-1) and x^3 + 4^(x-1). to prove that it's continuuous, i have to prove those two are equal
well there is an obvious solution
which turns out to be the only one
but thats not obvious
you definitely fucked up the question
cause that makes no sense
i have to prove those two are equal... when x goes towards 1
ok so a completely different question
it's the continuity question
well the limit x->1 for both functions is easy to calculate
yeah... i got the answer 2=2 which proves it's continuous
but i need to find all the x's in which it is
eyeballing it gives me one and zero i believe
can you post the original statement please
okay
Determine the interval of points where the following function is continuous: f:R->R, f(x)={x^2 + 3^(x-1) x is < than 1
{x^3 + 4^(x-1) , x is > or = to 1
its continuous for all x!=1 by just general knowledge of continuous functions
so you only need to care about x=1
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im drawing a blank and i dont want to looking it up because i want to know how to solve it
What can you do to isolate theta here
well first of all, what have you tried
dude idek ive stared at this and i genuinely cant think of anything
Well, I feel it would help if we could get the theta term on one side, so what can we do about that square root?
cot(x) = 1/tan(x) so you should use that and you would get (tan(x)) = 1/sqrt(3)
then u gotta lowk remember the unit circle thing
Don't give them the solution
i was gonna try to square -3 for -1.73 and move it to the other side
it'd do you better to just move the root 3 by itself
mb
so cot0 = - sqrt3
yes, good
now there's two ways you can get rid of the cot
well technically one
because the other is just a longer way of doing the first
with unit circle its like 30 degrees i thought
or whats what i got
idk if i did it wrong
You are close
you have that (\cot \theta = \sqrt{3})
now
Ryan + James (TCC)
let's take the arccot of both sides to get rid of the cot
(\arccot \cot \theta = \arccot \sqrt{3})
Ryan + James (TCC)
(\theta = \arccot \sqrt{3})
Ryan + James (TCC)
following
now the arccot here is asking you "what value's cotangent is \sqrt 3"
now the definition of the cotangent is (\cot = \frac{1}{\tan} = \frac{\cos}{\sin}) right?
Ryan + James (TCC)
$\theta$
Ryan + James (TCC)
correct
okay
so what angle gives you a tan theta of sqrt(3)/3?
30?
yes
You got it right earlier, I just wanted to see your thought process
yes
(\frac{\pi}{6})
Ryan + James (TCC)
okay
do you understand how to approach this sort of problem now?
Meh, I had to go look up a unit circle table myself, it's been a while since I've had to actively think about this stuff
(last I did was multivariable calculus over a year ago) -Ryan
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how do i solve $\log_x{3} + \log_3{x} = \ln{x}$
General_Jacob
use change of base to make everything natural logs
or log base 3, it doesn't matter, as long as all the x's are in the same log base
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wait
for that k there is no z = 0
as you can see
but for a different k (-1 i think) there will be
what
if i set z = 0
-y^2 for 2 cases k = -1 and k=0
for k = 0 its just -y^2 = 1
for k= 1 its just -y^2 = 0
k=1 makes sense its just 0 at the origin
but k = 0 doesnt make sense
yea
is different from the graph that looks like X which is labeled k = 1
and is also different from the graph that looks like β© which is unlabeled but should probably be like k = -1 or something
u said to set z = 0 and y = 0
what im asking is how to draw )( where do they get this from
for the )( in z axis we get that of k = 0 and set y = 0 right we get z = +-1/3
but how do we do that for y
did they mislabel that
weird, if x = 0 and y = 0 then z does have real solutions, so the β graph should be the x = 0 graph
wot
if x = 0, then your equation is 9z^2 - y^2 = 1, which is a hyperbola that goes through the points (y = 0, z = 1/3) and (y = 0, z = -1/3)
right?
yea
so that describes the β graph
now how do we get )(?
k is betwee -1<k<1
1-k^2, how can u have negative hyerbola
try it.....
does the x axis not go beyond 1?
i'm fairly sure the x axis goes beyond 1
yes bc they eventually become purely imaginary
whereas a hyperbola always has at least some real solutions
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Hi
the transformation would be 3 units to the left
and 1 unit down
idk i just guessed D is the correct graph because
it looked the most like what it should be
but im so confused
?
oh shit
and itβs 3 units left for what function?
log
no?
nope
2(x + 3/2)
(x, y) β> (x, y + 1) β> (x + 3/2, y + 1) β> (2x + 3, y + 1)
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hi im back, could i get some help with this problem? 
- A piece of work can be completed in 30 days by 10 men. If the work is to be completed 5 days earlier, how many more men are needed? (Assume that the men work at the same rate.)
so far i have '1 man = 30 x 10'
but im not sure where to put 25 (5 days earlier)
since they have to work at the same rate i cant make it '1 man = 25 x 10'
it should be 1 work = 30 days x 10 men instead
now we have 1 work = 30 days x 10 men = 25 days x ? men
ohhh ya
presumably for less days we need more manpower, so you have to figure that out with algebra
since we know 30 days x 10 men = 25 days x ? men,
that means 30 x 10 = 25 x ?, right
ya
now can you find out what ? is
300 = 25x?
sure, then?
x = 12
yep
wait im not sure if im allowed to use algebra tho
30 days x 10 men = 25 days x 12 men
or like variables
then you can think about it this way
you can think of 25/30 as a factor for how smaller the time we have is
25/30 = 5/6
so we only have 5/6ths of the time given, right
ya
this is a bit of a strange trick
but the more common way to think about it is
5/6x the time, so we need 6/5x the manpower
so reciprocal?
like with "double the manpower in half the time"
sure
np
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Help
do you have a question? if so, do post it
What is your question?
What step are you on?
1. I don't know where to begin.
2. I have begun but got stuck midway.
3. I got an answer but I was told that it's wrong.
4. I got an answer and would like my work checked.
5. I have a question about someone else's work/solution.
6. I have completed the problem and don't need help anymore. Thank you.
7. None of the above
I'm in need of help with fictional currency translation.
How much would Vash's double dollar bounty be worth translated to Woolong?
In the series "Trigun", the main character, "Vash", has a bounty of $$66,000,000,000. ($132,000,000,000 translated to USD)
According to the internet, one double dollar in Trigun is worth around $2 USD.
However, in the series "Cowboy Bebop", due to hyperinflation, 1 Woolong is worth $0.000031 USD.
So, if I'm correct, $$1 = $0.000062 correct?
according to someone on Reddit, I got this conversion backwards, though I didn't understand their explaination.
What step are you on?
1. I don't know where to begin.
2. I have begun but got stuck midway.
3. I got an answer but I was told that it's wrong.
4. I got an answer and would like my work checked.
5. I have a question about someone else's work/solution.
6. I have completed the problem and don't need help anymore. Thank you.
7. None of the above
i think we know where OP's at rn
2 and 3?
hmm
what are you trying to find?
the conversion rate between what and what? i see three currencies here and some contradictions
You already know $$1 = $2, so where did $$1 = $0.000062 come from
I'm trying to convert one fictional currency to another.
Double Dollars (from Trigun), wherein $$1 = $2 USD.
to Woolong's (from Cowboy Bebop), wherein W1 = $0.000031 USD
so according to my math, $$1 (double dollar from Trigun) should be worth 0.000062 Woolong.
According to Reddit, that conversion is backwards, and I don't know where I'm going wrong.
To put simply, I'm trying to translate Vash's $$66,000,000,000 double dollar bounty to Woolong. And since $$1 = $2, his bounty in USD should be $132,000,000,000 in the real world.
So, I'm trying to figure it out for Cowboy Bebop
So you have, 1W = $0.000031. That would mean for $1 you need approx 32258W (if reddit is correct)
and so, for $2, you need 64516W
and $2 = $$1
Correct
Oh
Yea, I see
The calculation I got was that Vash's bounty would only be W4,092,000, and I knew that had to be incorrect.
Though I'm still struggling to figure out what it'd actually be.
,calc 132000000000 / 0.000031
Result:
4.258064516129e+15
this much
4,258,064,516,129 Woolong?
Someone on Reddit managed to get 4,258,064,516,129,032 Woolong
(unless that additional 032, was supposed to be 32 cents
4,258,064,516,129,000 Woolong
Oh
I see, so my answer is over 4 quadrillion
yep
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i know my answer is wrong but i dont get why
what i did was
i know the volume is area of triangle times height
so i know the height of the triangle is 6 and height of prism is 15
so if i assume b is the base of the equilateral triangle
isnt the volume (6b/2)*15
which is 45b
and if i swap the heights
i also get 45b
so i got the answer as 1
but i def did smth wrong
sure, but b is gonna be different when you swap the H and h
wait why didnt he use the right number for the base either way even if he swapped the H and h
the height of an equilateral triangle is related to its base
swapping H and h would lead to different values of b as well
i dont get it wouldnt he already know b?
you need to calculate it from the correct height
*base
you only know h and H
you dont know b
write out the equation to calculate b and I think that'll help you understand
how would i do that
Why are you talking in 3rd person, aret you the david in the problem
lolll i js realized
well you know it's an equilateral triangle and you're given h
so( b/2)/6=tan30
or you can just use the 30 60 90 triangle rule
so if h is 6
yeah i get that so far
so if $h = x\sqrt{3}$
satvik
ohh then sub in either 6 or 15 first for h
$x = \frac{h}{\sqrt{3}}$
satvik
you should be able to do the rest
so if i say 6 then x= 6/root 3
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been doing this for a long time
i rewrote it the fraction as
$\frac{(-1)^n x^{2n}}{(2n+1)}$
to solve the sum at x=sqrt1/3
or prove convergence
calculate it exactly
nah
haveaniceday12
so it looks a lot like the taylor series for ln(1+x) and ln(1-x)
uh is this taylor series
not exactly but with i believe we're supposed to turn it into one through some integration and or differentiation
it's just the odd terms of the taylor series for ln(1+x) with alternating signs
i think i got it one escond
sure is
wait you can get all of the even terms in the taylor series by like using ln(1-x^2) right or something like that
this is a direct sub into one of the common taylor series formulas
does the ln series have a 2n+1 on the bottom?
unfortunately no
wait so we have all terms even and odd from ln(1-x)
it's all of the odd terms from ln(1+x) with alternating signs
or ln(1-x) technically
indeed
yup
that's what i thought with that too i tried it and i couldn't get anywhere with it
the taylor expansion of ln(1-x^2) will be the same thing for ln(1-x) except each exponent will be doubled
all of the even terms have the same sign, how are you going to cancel those out with the alternating series for ln?
subtract ln(1-x^2)/2
the answer to it is $\frac{\pi}{2\sqrt{3}}$
haveaniceday12
acccording to wolframalpha
oh wait what is the expansion for ln(1+x^2)
you were blazing hot right here youβre one step away from the key to the solution
hm
because then i made it
$\displaystyle \frac{1}{x} \sum_{n=0}^{\infty} \frac{(-1)^n x^{2n+1}}{(2n+1)}$
haveaniceday12
whatβs the taylor series expansion for $\frac{1}{1+x^2}$? what happens when you integrate it?
cytos
arctan
yes
it's the same as 1/1-x where x is -x^2
wow i think i see it now
thank you so much
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is this role can be used into this question ?
or should i use this one ?
it's the same
pretty much the same thing
i think you can intergrate separetly
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R(x)=xΒ²-2x+2 and Q(x)= 2xΒ²-4x+3, how do i use completing the square here
,tex .cts
γ’γγ© (>β©<)
why not simplify the 2/2
why are you adding/subtracting the x term
@fair wing you here?
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@fair wing looks like thats fixed
ok so
i am doing x2-2(1) (x) +2-2+2
xΒ²-2(2x/2) + (2x/2)Β² - (2x/2)Β² + 2
This is correct ig ^
wait
whatare we doing here
completing the square for ${R(x)}$ and ${Q(x)}$ indpendently, right?
k
@fair wing
this is very basic thing but i am stuck here
ok
what do u notice abt the term containing x^2 and x
can u think of a perfect square containing x^2 + 2x?
it should be +
x+1) Β²
k
Yes ofc
k
Yes
We can substitute this back into our original thing
${x^2 + 2x + 2 = (x^2 + 2) + 2 = (x+1)^2 - 1 + 2}$
k
Yeah
combine the last two terms
all should be done
now
could u do a similar thing for Q(x)?
Yes
first factor out 2 from the first two terms
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why is the decreasing interval (-infinity, -1]u(0, 2) and not (-infinity, -1)u(0, 2) ?
i dont understand why -1 is included in the decreasing interval, but not included in the increasing one (-1, 0)u(2, infinity)
theres no real reason for this, presumably they want -1 to either be in the increasing interval or in the decreasing one, so they just chose one of them
I have taught to not include -1 or 2 here
shouldn't really be included in either
the correct way is to stick to "dont include them at all"
or to stick to "always include them (in specific contexts)"
instead of halfway inbetween like here
so the second answer i mentioned technically wouldnt have been wrong?
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I wanna learn how to do algebraic division T -T
wdym by algebraic division?
do you have a specific math problem you're stuck on
You mean polynomial division.......?
@lusty crystal could you elaborate on your problem
you can (and should) send a picture
do you know how long division for regular numbers works?
Like, normal long division method is easy but idk how to do this
Yes sir
please don't call me "sir".
I did this but idk what I did
I copied it from my friend's notebook
ok right so
maybe we should revisit long division for regular numbers to think about what you're really doing
can i have you work out 5238 / 7 and stop when you hit the remainder
Sure
just for demonstration purposes, this should be large enough to work while not being absurdly large
I'mma do it real quick
Alright
i'll be right back
I would've gone to the depths of hell for the answer with decimals
@stark wedge 748
i want to see your process and work lol
i was gonna comment on it and show you how it relates to polynomial division
I think
I might've understood how an algebraic long division method workss
The only difference is that, it goes + - +-
That's it
Can you give me an algebraic long division question
sure.
divide x^5 + 8x^4 - 3x^3 + 9x^2 - 10x + 25 by x - 2. show all work.
it isn't that hard tbh, just takes some careful work
I can't do it anymore π
My head is like a maze rn
@stark wedge
First divide x by xβ΅ then I get xβ΄, then I multiply x-2 by xβ΄ and write xβ΄ at the top
Then I repeat it
ok lemme check your arithmetic
you mean divide x^5 by x though
you copied it as +9x^3..
also yeah you miscopied the dividend
Wha
also if we ignore that, 94x+25 requires one more step
Like like terms?
you miswrote the x^2 term as if it were x^3
3xΒ³
Oh
damn
I just added the like terms (Cuz I wrote them wrong, so they became like terms Cuz xΒ³
so yea)
But did I do it right tho?
I know it takes one more step, but my brain isn't braining enough to add 188 with 25
yk what, i'mma add it
213
do you know column addition
honestly there is no reason to despair
if i saw anything wrong with your arithmetic i would have said it
"stopped one step short" is one of the easiest things to correct
What's that
Lmfao
So basically, I just need a bit (alot...) of practice
yeah that
don't do things in brain except if you are 120% certain you could do them at gunpoint flawlessly
after being woken up at 3 in the morning
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I can
I. Can.
Hesitation kills the bird
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I bet there are some unconventional way to identify independent two events
Letβs say I roll a fair dice, and A is the event where I get 1,3,or 4as the result. B is where I get even numbers
Are A and B independent
A and B are independent events if P (A and B) = P(A) x P(B)
That's sorta the definition of independence
What is the intuition? Can I tell if they are independent by reasoning
Yeah, rolled 1,3,4 didn't affect the out come of when you roll even
If the one event affect the outcome of other event then they're not independent event
it sorta does though
oh come on it's a PNG
The probability that A, given B, will happen is definitionally the probability of both happening over the probability of B happening
But if they're independent, then P(A|B) = P(A)
Rearrange
Yes, I know that. But I wonder if I can solve their relationship by reasoning
Like whether I take a poop now is doesnβt affect whether you eat a sandwich
These two events are independent
Can I do it the same way? Can I tell if A and B are independent by reasoning
Or there another way that do not rely on this formula?
i believe we have to be careful about the difference between independent events and mutually exclusive events
P(A) = 1/2, P(B) = 1/2, P(A β© B) = 1/6
Hi
What if you are deprived of the ability to do math
Uhh what do you mean
Like any mathematical definition is took away from you
So let me clarify what you want
You want a solid unambiguous definition of a mathematical concept without using the technical terminology constructed for the sole purpose of precise mathematical arguments
Yes
Okay build a rocket with nothing but pebbles
Do you see the absurdity of your request
well, in this specific case B is obviously less likely to happen if we know that A happened. If A happened, then there is only a 1/3 chance of landing at even number
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how did 3x grow a ^2
ik i could just put y value in second buh
also i think you kinda made your own life difficult
would you like an easier thing to do or do you want to continue with this specific method
yea
what did i do wronh
how did 3x grow a ^2


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