1.

If Sn denotes the sum of first 'n' terms of an A.P. andS3n−Sn−1S2n−S2n−1=31 then the value of n is

Answer»

If Sn denotes the sum of first 'n' terms of an A.P. andS3nSn1S2nS2n1=31 then the value of n is




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