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Combinations & Permutations

C(n,r) and P(n,r) with or without repetition — formula display and large-number formatting.

Inputs

Total items n

items

Items chosen r

chosen

Type

Order does not matter — selecting a group

Repetition

Results

Combinations—

Formula

C(n, r) = n! / (r! × (n−r)!)

Unordered selection, no repeats