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Question Number 138600 by Raxreedoroid last updated on 15/Apr/21

prove or disprove Σ_(k=1) ^n f(k)=f(1)+Σ_(k=2) ^n (((Σ_(i=1) ^(k−1) (−1)^(i+1) f(i+1)C_(i−1) ^(k−2) )/((k−1)!)) Π_(i=1) ^(k−1) (n−i))

proveordisprove∑nk=1f(k)=f(1)+∑nk=2(∑k−1i=1(−1)i+1f(i+1)Ci−1k−2(k−1)!∏k−1i=1(n−i))

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