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Question Number 160160 by cortano last updated on 25/Nov/21

    Σ_(k=1) ^n  (1/((2k)!(2n−k)!))=?

$$\:\:\:\:\underset{{k}=\mathrm{1}} {\overset{{n}} {\sum}}\:\frac{\mathrm{1}}{\left(\mathrm{2}{k}\right)!\left(\mathrm{2}{n}−{k}\right)!}=? \\ $$

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