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In mathematics, the notion of permutation relates to the act of arranging all the members of a set into some sequence or order, or if the set is already ordered, rearranging (reordering) its elements, a process called permuting.s another example, an anagram of a word, all of whose letters are different, is a permutation of its letters. In this example, the letters are already ordered in the original word and the anagram is a reordering of the letters.
Combinations, on the other hand, are pretty easy going. The details donât matter. Alice, Bob and Charlie is the same as Charlie, Bob and Alice. Permutations are for lists (order matters) and combinations are for groups (order doesnât matter). A joke: A combination lock should really be called a permutation lock. The order you put the numbers in matters.