RaphaelFilgueiras
What is the summation of:



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RaphaelFilgueiras
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dw:1357507840261:dw

SmoothMath
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\[\Large \left(\begin{matrix}n \\ i\end{matrix}\right)^2\]

RaphaelFilgueiras
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this is the real problem

anonymous
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pretty sure it is \(\dbinom{2n}{n}\) but i can't off the top of my head remember why

RaphaelFilgueiras
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i want to find pi0

RaphaelFilgueiras
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@satellite73 the book says something about hypergeometric distribuction

RaphaelFilgueiras
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actually (2n,n) is just pi0

anonymous
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i am afraid i do not know the meaning of \(\pi_0\)

RaphaelFilgueiras
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it is just a probability

RaphaelFilgueiras
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dw:1357508663436:dw

anonymous
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oh i see you are supposed to prove that it is a probability by showing the sum is one
hmmm

RaphaelFilgueiras
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no i have to find pi0,i know it's a probability

anonymous
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i guess i am useless here sorry

RaphaelFilgueiras
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dw:1357508806154:dw

RaphaelFilgueiras
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acctualy you are rigth were the hell this (2n,n) come from?