Factorial Calculator
Calculate factorials, combinations nCr, and permutations nPr.
About This Calculator
Calculate factorials, combinations (nCr), and permutations (nPr) with visual growth chart.
Frequently Asked Questions
What is a factorial?
n! = n x (n-1) x ... x 1.
What is nCr and nPr?
nCr = combinations, nPr = permutations.
Frequently Asked Questions
What is a factorial?
n! = n x (n-1) x (n-2) x ... x 1. For example, 5! = 5x4x3x2x1 = 120.
What is nCr and nPr?
nCr (combinations) counts ways to choose r items from n without order. nPr (permutations) counts ways with order.