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Results tagged with enumerative-combinatorics
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user 140124
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Sum of all products of k distinct integers in [1,n] [duplicate]
Let $S=\{1,2,3,...,n\}$ be the set of integers up to $n$ and $p_k(a_1,...,a_k)=a_1\cdots a_k$ the product of $k$ distinct integers $a_1,...,a_k \in S$. There are $\binom{n}{k}$ possibilities to constr …
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