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Permutation

Enhanced ACT Glossary

An arrangement of items in which order matters, counted by P(n,r) = dfracn!(n-r)!.

More Enhanced ACT terms

(n factorial) just means multiply every whole number from $n$ down to 1. Quick gut check: if swapping two items would make a DIFFERENT result (seats, rankings, passwords), order matters and it's a permutation.","aliases":[],"topic":"ACT","priority":"specialized","learningStage":"intermediate","prerequisiteIds":[],"questionCount":2,"tryQuestionId":"ACT_2853","courseId":"act","publicSeo":true,"seoSlug":"permutation-ncmap0"}

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Permutation

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