In an \( A P \), if \( s_{n} \) is the sum of the first \( n \) terms ( \( n \) is odd) and \( S....

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In an \( A P \), if \( s_{n} \) is the sum of the first \( n \) terms ( \( n \) is odd)
\( \mathrm{P} \)
and \( S_{n}{ }^{\prime} \) is the sum of the terms of the series in odd
W
places then \( s_{n} / s_{n}^{\prime}= \)
(1) \( 2 n / n+1 \)
(2) \( n / n+1 \)
(3) \( n+1 / 2 n \)
(4) \( n+1 / n \)



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