JEE maths #7

Algebra Level 4

Let $C_0, C_1, C_2 ..., C_n$ be the binomial coefficients of the expansion $(1+x)^n$ , where $n \in \mathbb N$ . If $S_n = \dfrac {2C_0}2 + \dfrac {2^2C_1}6 + \dfrac {2^3C_2}{12} + \cdots + \dfrac {2^{n+1}C_n}{(n+1)(n+2)} + \dfrac 1{n+1} + \dfrac 1{2(n+1)(n+2)}$ , then find the value of $\dfrac {S_7}{S_6}$ .

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