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Archives => Public Archives => Real Life Discussion => Topic started by: Wayshow on May 20, 2012, 02:38:11 pm
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(http://img137.imageshack.us/img137/6220/l1090381.jpg) (http://imageshack.us/photo/my-images/137/l1090381.jpg/)
inb4lolasianaskingforhelponmaths
No but srs. I pay 1.5m/question solved. first person to solve gets it.
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Too advanced for me. Thats Tom you should be asking
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I can pretty much do everything on the calculus textbook....except sequences, series. The convergence question is just wtf lol
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(http://i.imgur.com/r1FPf.png)
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I probably could have done this last year but my brain has now forgotten most of A-Level maths.
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screw math youll never use it
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screw math youll never use it
i need it to graduate :@
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I love how clean your paper is, my papers are always full of drawings and shit lol :nyan:
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This isn't technically right, but I know where it converges.
There is probably a way to "show" it converges, I'm just assuming it does.
Q11a)
a(n) = sqrt (3 + a(n-1))
a(n+1) = sqrt( 3 + sqrt (a(n))
a(n+1) = sqrt (3 + sqrt (3 + a(n-1)))
a(n+1) - a(n) = sqrt (3 + sqrt(3 + a(n-1))) - sqrt (3 + a(n-1))
If we assume series converges, a(n+1) - a(n) = 0
sqrt(3 + a(n-1)) = sqrt(3 + sqrt(3 + a(n-1)))
Square both sides
3 + a(n-1) = 3 + sqrt (3 + a(n-1)
a(n-1) = sqrt (3 + a(n-1))
Square again
a(n-1)^2 = 3 + a(n-1)
a(n-1)^2 - a(n-1) -3 = 0
a(n-1) = 2.302775637
Thats where your series converges.
What I've done is incorrect though, I find a(n-1) instead of a(n).
Unless we assume a(n-1) = a(n). But then I just assumed convergence instead of proving it.
I know it involves subtracting something like a(n+1) away from a(n) and showing it equals something.
On a side note, nobody uses this stuff in the real world anyway.
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This isn't technically right, but I know where it converges.
There is probably a way to "show" it converges, I'm just assuming it does.
Q11a)
a(n) = sqrt (3 + a(n-1))
a(n+1) = sqrt( 3 + sqrt (a(n))
a(n+1) = sqrt (3 + sqrt (3 + a(n-1)))
a(n+1) - a(n) = sqrt (3 + sqrt(3 + a(n-1))) - sqrt (3 + a(n-1))
If we assume series converges, a(n+1) - a(n) = 0
sqrt(3 + a(n-1)) = sqrt(3 + sqrt(3 + a(n-1)))
Square both sides
3 + a(n-1) = 3 + sqrt (3 + a(n-1)
a(n-1) = sqrt (3 + a(n-1))
Square again
a(n-1)^2 = 3 + a(n-1)
a(n-1)^2 - a(n-1) -3 = 0
a(n-1) = 2.302775637
Thats where your series converges.
What I've done is incorrect though, I find a(n-1) instead of a(n).
Unless we assume a(n-1) = a(n). But then I just assumed convergence instead of proving it.
I know it involves subtracting something like a(n+1) away from a(n) and showing it equals something.
On a side note, nobody uses this stuff in the real world anyway.
If you got a(n-1)
and need a(n)
add 1 -.^ -.^ -.^ -.^ -.^ -.^ -.^ -.^ -.^ -.^ -.^ -.^ -.^
lol i smart cuz its not wrong at all
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lol you maths nerds ##
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This isn't technically right, but I know where it converges.
There is probably a way to "show" it converges, I'm just assuming it does.
Q11a)
a(n) = sqrt (3 + a(n-1))
a(n+1) = sqrt( 3 + sqrt (a(n))
a(n+1) = sqrt (3 + sqrt (3 + a(n-1)))
a(n+1) - a(n) = sqrt (3 + sqrt(3 + a(n-1))) - sqrt (3 + a(n-1))
If we assume series converges, a(n+1) - a(n) = 0
sqrt(3 + a(n-1)) = sqrt(3 + sqrt(3 + a(n-1)))
Square both sides
3 + a(n-1) = 3 + sqrt (3 + a(n-1)
a(n-1) = sqrt (3 + a(n-1))
Square again
a(n-1)^2 = 3 + a(n-1)
a(n-1)^2 - a(n-1) -3 = 0
a(n-1) = 2.302775637
Thats where your series converges.
What I've done is incorrect though, I find a(n-1) instead of a(n).
Unless we assume a(n-1) = a(n). But then I just assumed convergence instead of proving it.
I know it involves subtracting something like a(n+1) away from a(n) and showing it equals something.
On a side note, nobody uses this stuff in the real world anyway.
Ty for trying though :3
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And.... I finished #10. Yay
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school is only useful for 6 months after it ends :3
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Screw the rules drop out while you're ahead wayshow, YOU ALREADY GOT INTO COLLEGE