If a. b, c and d are the coefficients of 2nd, 3rd, 4th and 5th terms respectively in the binomial expansion of `(1+x)^n`, then prove that `a/(a+b) + c/(c+d) = 2b/(b+c)`

Explanation

To solve the problem, we need to find the coefficients \(a\), \(b\), \(c\), and \(d\) for the second, third, fourth, and fifth terms of the binomial expansion of \((1+x)^n\) and then prove the given equation.

### Step 1: Identify the coefficients

The general term in the binomial expansion of \((1+x)^n\) is given by:

\[
T_k = \binom{n}{k-1} x^{k-1}
...