Let Sn be the sum of first n terms of an A.P. If S10 = 390 and the ratio of the tenth and the f....

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Let Sn sum first n terms AP. If S10 = 390 and the ratio tenth & fifth terms is 15 : 7, S15 – S5 i

Let Sn sum first n terms AP. If S10 = 390 and the ratio tenth & fifth terms is 15 : 7, S15 – S5 i

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