Let \( S_{n} \) denote the sum of first \( n \) terms of an A.P. If \( S_{2 n}=3 S_{n} \), then f...

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Let \( S_{n} \) denote the sum of first \( n \) terms of an A.P. If \( S_{2 n}=3 S_{n} \), then f...
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