Find the sum to `n` terms of the series: `1/(1. 3)+1/(3. 5)+1/(5. 7)+`

Explanation

To find the sum to \( n \) terms of the series

\[ S_n = \frac{1}{1 \cdot 3} + \frac{1}{3 \cdot 5} + \frac{1}{5 \cdot 7} + \ldots \]

we can express the \( r \)-th term of the series as:

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