Combination & Permutation Calculator

Calculate the number of combinations (nCr) and permutations (nPr) for choosing r items from n.

n (total items)

r (items chosen)

Combinations C(n,r)

120

Permutations P(n,r)

720

So funktioniert's

Permutations count ordered arrangements: P(n,r) = n!/(n−r)!. Combinations count unordered selections: C(n,r) = P(n,r)/r!.

Permutations care about order (ABC ≠ BCA); combinations don't (ABC = BCA counts once).