n chooses k n on top k below in brackets

what that means

like 75 on top 3 below in brackets

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- May 9th 2011, 12:45 PMmath321n choose k
n chooses k n on top k below in brackets

what that means

like 75 on top 3 below in brackets - May 9th 2011, 12:47 PMmr fantastic
- May 9th 2011, 12:47 PMTheEmptySet
$\displaystyle \binom{n}{k}=\frac{n!}{(n-k)!k!}$

$\displaystyle \binom{75}{3}=\frac{75!}{(72)!3!}$ - May 9th 2011, 01:17 PMPlato