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Question Number 29984 by abdo imad last updated on 14/Feb/18
prove that Σ_(n=1) ^∞ (H_n /(n!))==e Σ_(n=1) ^∞ (((1)^(n−1) )/(n (n!))) .
provethat∑n=1∞Hnn!==e∑n=1∞(1)n−1n(n!).

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