Permutation

A permutation is a way to arrange things in a particular order. It could be numbers, words, pieces of a puzzle, or anything else! For example, if you had five pieces of a puzzle, the possible permutations (arrangements) of those pieces would be 5 x 4 x 3 x 2 x 1, which is 120 different possible ways of arranging the pieces.

Related topics others have asked about:

Alternating permutation, Convolution, Cyclic order, Even and odd permutations, Josephus permutation, Levi-Civita symbol, Major index, Permutation category, Permutation group, Permutation pattern, Permutation representation (symmetric group), Probability