Question
Sum to $n$ terms of the series $\frac{1}{1 \cdot 3}+\frac{1}{3 \cdot 5}+\frac{1}{5 \cdot 7}+\ldots .$ is(A) $\frac{n}{2 n+1}$(B) $\frac{n}{2 n-1}$(C) $\frac{n-1}{2 n+1}$(D) None of these
Step 1
$ We can observe that the nth term of this series can be written as $\frac{1}{(2n-1)(2n+1)}$. Show more…
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