nPr Calculator

Will calculate the permutations for P(n,r) = n! / (n - r)!. "The number of ways of obtaining an ordered subset of r elements from a set of n elements."[1]

For r <= n, n >= 0, and r >= 0.

Permutations Formula:

P(n,r) = n! / (n - r)!

References

[1] For more information on permutations and combinations please see http://mathworld.wolfram.com/Permutation.html