Permutation vs combination?

Permutation: order matters (ABC ≠ BCA). Combination: order doesn't matter (ABC = BCA).

Use permutation for rankings, arrangements, passwords. Use combination for teams, groups, lottery.

n factorial = n × (n-1) × (n-2) × ... × 1. Example: 5! = 120.

Last Updated: April 13, 2026

Permutation & Combination Calculator

Free permutation and combination calculator. Calculate nPr and nCr for probability and counting.

n (total items)

r (chosen)

Permutation P(n,r)

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Combination C(n,r)

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