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If Sn=^nC0.^nC1+^nC1.^nC2+.....+^nC(n-1)...

If `S_n=^nC_0.^nC_1+^nC_1.^nC_2+.....+^nC_(n-1).^nC_n` and if `S_(n+1)/S_n=15/4` , then the sum of all possible values of n is (A) `2` (B) `4` (C) `6` (D) `8`

A

3

B

6

C

7

D

5

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