- #1

workerant

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## Homework Statement

Ok, my teacher wants us to compute:

(2n choose n)^2/(4n choose 2n) using Stirling's formula.

## Homework Equations

Stirling's formula is sqrt(2pi) e^-n * n^(n+.5)

## The Attempt at a Solution

Ok, I'm just confused about how you compute something with n in it...I mean, I get how to use Stirling's formula for factorials, but how do you compute that probability that is requested when there are ns in the (2n choose n)^2/(4n choose 2n)...what do I plug into stirling's formula? I don't know how to really attempt a sensible solution when I don't know what to put for n. Thanks.