If sum of n terms of A.P. is Sn and S2n=3Sn then S3n :Sn will be (a) 10 (b) 11 (c) 6 (d) 4​

Question

If sum of n terms of A.P. is Sn and

S2n=3Sn then S3n :Sn will be

(a) 10 (b) 11 (c) 6 (d) 4​

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Isabelle 3 months 2021-10-15T14:04:11+00:00 1 Answer 0 views 0

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    2021-10-15T14:05:18+00:00

    Answer:

    b)6

    S3n=3n(3n+1)/2……..(1)

    Sn=n(n+1)/2………..(2)

    Dividing (1) from (2) and substituting the value of n as 1, we get the ans as 6.

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14:4+1-6*5-7*14:3+5 = ? ( )