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🔢 Combinations & Permutations Calculator

C(n,r) when order doesn't matter, P(n,r) when it does.

Quick answer: choosing 3 items from 10 gives C(10,3) = 120 combinations, or P(10,3) = 720 permutations if order matters. Enter your own n and r below.

n (total items)

r (items chosen)

Combinations & permutations

Enter n and r to see both C(n,r) and P(n,r).