Calculate The Combination Of N Objects Taken R At A Time
Write a program to calculate the combination of n objects taken r at a time
Combination is a selection of objects from a group such that (unlike permutations) the order of selection does not matter. The number of combinations on n objects taken r at a time is given by the formula n!/(r!(n-r)!) = n(n-1)(n-2)...(n-r+1)/r!
Input : 5, 2 Output : 10
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