Wednesday, 20 January 2016

sequences and series - Evaluating sumlimitsa1i=1i=fraca(a1)2

I'm pretty sure a1i=1i=a(a1)2 using the relationship ni=1i=n(n+1)2.



It looks similar to ni=ai=(n+a)(na+1)2 but I'm not sure how or why doesni=ai=(n+a)(na+1)2?

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