Combinations and permutations in the mathematical sense are described in several articles.
Described together, in-depth:
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Twelvefold way
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 ...
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Permutation
In mathematics, a permutation of a set can mean one of two different things:
* an arrangement of its members in a sequence or linear order, or
* the act or process of changing the linear order of an ordered set.
An example of the first mean ...
For meanings outside of mathematics, please see both words’ disambiguation pages:
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Combination (disambiguation)
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Permutation (disambiguation)
{{Mathematics disambiguation