Combination and Permutation Calculator
Calculate combinations nCr ("n choose r") and permutations nPr: how many ways to pick r items from n.
About the Combination Calculator
nCr = n!/(r!(n−r)!) counts selections where order does not matter; nPr = n!/(n−r)! counts ordered arrangements. A hand of 5 cards from 52 is a combination; the podium of a 8-runner race is a permutation.