Permutation & Combination Calculator

Four counting formulas — nPr, nCr, n^r (repeats allowed), and multiset combinations — with BigInt so large values stay exact. Type, paste, see the answer, copy it.

Mode nPr — permutation, no repeat nCr — combination, no repeat n^r — permutation, repeat (n+r−1)!/(r!(n−1)!) — multiset

n total items r chosen at a time