Permutations

Statistics

A permutation is an ordered combination of a set of items. (For example, ABC is a distinct permutation from ACB because they are ordered differently.) When order doesn’t matter, it’s called a combination. To calculate a possible number of permutations, we use the formula for nPr, where n represents the total number of items being chosen from, and r represents the number of items we are choosing (“n different things taken r at a time”):

permutations

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