Combinations and permutations in the mathematical sense are described in several articles.
Described together, in-depth:
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Twelvefold way
In combinatorics, the twelvefold way is a systematic classification of 12 related enumerative problems concerning two finite sets, which include the classical problems of counting permutations, combinations, multisets, and partitions either of ...
Explained separately in a more accessible way:
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Combination
In mathematics, a combination is a selection of items from a set that has distinct members, such that the order of selection does not matter (unlike permutations). For example, given three fruits, say an apple, an orange and a pear, there are th ...
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Permutation
In mathematics, a permutation of a set is, loosely speaking, an arrangement of its members into a sequence or linear order, or if the set is already ordered, a rearrangement of its elements. The word "permutation" also refers to the act or pro ...
For meanings outside of mathematics, please see both words’ disambiguation pages:
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Combination (disambiguation)
A combination is a mathematical collection of things in a context where their specific order is irrelevant.
Combination, combinations, or combo may also refer to:
* Combination (chess), a relatively long sequence of chess moves, involving tempora ...
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Permutation (disambiguation)
{{Mathematics disambiguation