Posted by **keshav** on Sunday, June 9, 2013 at 12:04am.

For how many ordered pairs of positive integers n and k with n and k less than or equal to 20, is the number (2n)!(2k)!/n!k!(n+k)! an integer?

- maths -
**rishabh**, Sunday, June 9, 2013 at 4:36am
can anybody solve it..?

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