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Let Sn denote the sum of first n terms o...

Let `S_n` denote the sum of first n terms of an AP and `3S_n=S_(2n)` What is `S_(3n):S_n` equal to? What is `S_(3n):S_(2n)` equal to?

A

(a) 9

B

(b) 6

C

(c) 16

D

(d) 12

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