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Question Number 25457 by Tinkutara last updated on 10/Dec/17
Answered by prakash jain last updated on 10/Dec/17
n2+n+1=an(n−1)+bn+cn(n−1)+2n+1∑ni=1(−1)ii2+i+1i!=∑ni=1(−1)ii(i−1)+2i+1i!=∑ni=2(−1)i1(i−2)!+∑ni=1(−1)i2(i−1)!+∑ni=1(−1)ii!expandandsum−sometermwillcancel
Commented by Tinkutara last updated on 10/Dec/17
Yes Sir thanks it telescopes
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