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If S = 2 + 6/7 + 12/7^2 + 20/7^3 + ...... + ∞, then the value of 4 s is

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If S = 2 + 6/7 + 12/72 + 20/73 + ...... + ∞, then the value of 4 s is

(1) (7/3)2

(2) (7/3)3

(3) (7/3)4

(4) (7/3)5

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Correct option is (2) (7/3)3

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