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

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

A

`3:2`

B

`6:1`

C

`8:3`

D

`10:7`

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