question involving sums and combinations

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# question involving sums and combinations

Submitted by ogness on Sat, 01/03/2015 - 00:26

Forums:

m and n are integers prove that :

sum(i=-m to n) (-1)^|i| * ((2m+i)! (2n-i)!)/((m+i)!^2 (n-i)!^2)) = 1

you can find it here: http://mymathforum.com/math-events/35463-sum.html

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