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If S(1),S(2),S(3)be respectively the sum...

If `S_(1),S_(2),S_(3)`be respectively the sum of n, 2n and 3n terms of a GP, then `(S_(1)(S_(3)-S_(2)))/((S_(2)-S_(1))^(2))` is equal to

A

(a) 1

B

(b) 2

C

(c) 3

D

(d) 4

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