lin7xu's blog

A math fomula
By lin7xu, history, 3 years ago, In English
$$$\huge\binom{2n}{n}\approx \frac{2^{2n}}{\sqrt{n}}$$$

Can someone tell me why?thx

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3 years ago, # |
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Stirling's approximation.

Apply it to the factorial formula of 2n choose n.

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