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Permutations

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Permutations[list]

gives all possible orderings of the items in list.

Permutations[list, n]

gives permutations up to length n.

Permutations[list, {n}]

gives permutations of length n.

• • Permutations[{y, 1, x}]

Elements are differentiated by their position in list, not their value.

• • Permutations[{a, b, b}]

• • Permutations[{1, 2, 3}, 2]

• • Permutations[{1, 2, 3}, {2}]