Skip to main content

Counting Methods

Calculate factorials, permutations, and combinations

Factorial

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

The number of ways to arrange n distinct objects.

Result

5!=1205! = 120

Interpretation

There are 120 different ways to arrange 5 distinct objects.