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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

1

B

2

C

3

D

4

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