Mark the correct alternative in each of the following: If, \( S_{1} \) is the sum of an arithmet...

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Mark the correct alternative in each of the following:
If, \( S_{1} \) is the sum of an arithmetic progression of \( n \) odd number of terms and \( S_{2} \) the sum of the terms of the series in odd places, then \( \frac{S_{1}}{S_{2}}= \)
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