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| 1. |
Let the sum of n , 2 n , 3 n terms of an A.P. be S 1 , S 2 and S 3 , respectively, show that S 3 = 3 (S 2 – S 1 ) |
| Answer» Let the sum of n , 2 n , 3 n terms of an A.P. be S 1 , S 2 and S 3 , respectively, show that S 3 = 3 (S 2 – S 1 ) | |