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1972 IMO Problems/Problem 3

Revision as of 16:38, 17 October 2014 by Mjhassan (talk | contribs)

Let $m$ and $n$ be arbitrary non-negative integers. Prove that \[\frac{(2m)!(2n)!}{m!n!(m+n)!}\] is an integer. ($0! = 1$.)

Solution

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