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Permutations Calculator (nPr)
Calculate the number of ordered arrangements of r items from n items.
About This Calculator
Permutations count ordered arrangements — the number of ways to win gold, silver, and bronze from 8 runners is P(8,3) = 336. Combinations divide this by r! to remove order. Password cracking time estimates use permutations: a 6-character alphanumeric password has 62^6 = 56.8 billion permutations.