Statistics & Probability
Basic

Factorial

Product of all positive integers up to n.

Formula

n!=n×(n−1)×⋯×2×1n! = n\times(n-1)\times\cdots\times 2\times 1

Variables

nNon-negative integer

Example

5! = 120

Did You Know?

Factorials grow astonishingly fast — just 70! already exceeds a googol (10¹⁰⁰).

factorialcombinatorics