Step 1:
First, we write out the first few terms of the series to see if we can identify a pattern:
\begin{align*}
n=1: & \ \frac{1}{1}-\frac{1}{3} \\
n=2: & \ \frac{1}{2}-\frac{1}{4} \\
n=3: & \ \frac{1}{3}-\frac{1}{5} \\
& \ \vdots
\end{align*}
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