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Multiset

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A multiset is a collection of unordered objects.

Unlike sets, elements of multisets need not be distinct.

Multiset coefficient

The number of multisets of size k taken from a set of cardinality n is denoted by the multiset coefficient, denoted by \left(\!\!\tbinom{n}{k}\!\!\right) , and is equal to:

\left(\!\!\binom{n}{k}\!\!\right)=\binom{n+k-1}{k}=\binom{n+k-1}{n-1}


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