If \( S_{n} \) denotes the sum of first \( n \) terms of an A.P. and \( S_{2 n}=3 S_{n^{\prime}}... VIDEO
If \( S_{n} \) denotes the sum of first \( n \) terms of an A.P. and \( S_{2 n}=3 S_{n^{\prime}} \) then find \( S_{3 n}: S_{n} \).https://bit.ly/YTAI_PWAP https://www.pw.live
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