\frac{1}{1,3}+\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{(2 n-1)(2 n+1)}=\fr – InterviewSolution

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\frac{1}{1,3}+\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{(2 n-1)(2 n+1)}=\frac{n}{2 n+1}

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