Sunday, September 25, 2016

sequences and series - Evaluating suminftyn=1frac1n(2n+1)(2n1)


According to Wolfram Alpha, n=11n(2n+1)(2n1)=ln(4)1 However, I am not sure how to evaluate this series.


Attempt 1n(2n+1)(2n1)=An+B2n+1+C2n1 1=A(2n+1)(2n1)+Bn(2n1)+Cn(2n+1)


Then, I got n=11n(2n+1)(2n1)=n=11n+12n+1+12n1 I tried to view this as a telescoping series, but it did not turn out good. Can I have a hint?


Answer



n1(12n112n)n1(12n12n+1)=ln2(1ln2)


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