Combinations & Permutations

Calculate C(n,r) combinations and P(n,r) permutations.

n (total items)

r (items chosen)

Combinations C(10,3) — order doesn't matter12010! / (3! × 7!)

Permutations P(10,3) — order matters72010! / 7!

n!3,628,800

3!6

7!5,040