Let S(n) denote the sum of first n terms...

Let `S_(n) `denote the sum of first n terms of an A.P. If `S_(2n) = 3S_(n)`, then the ratio `( S_(3n))/( S_(n))` is equal to `:`

A

4

B

6

C

8

D

10

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The correct Answer is:

B

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