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COMBINATORICA: COMBINATIONS (C) AND PERMUTATIONS (P) CALCULATOR
N M

NPM=

NCM=

Permutations (M_P_N) are calculated as:

NPM = N! / (N-M)!

Combinations are calculated as:

NCM = N! / ( (N-M)! * M! )

where N = total number of objects, M - number of object in selected groups
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