JEE Main 2015 Mathematics question

The sum of coefficients of integral powers of x in the binomial expansion of is

Answer: (2)

Solution

The general term is , which has an integral power of x exactly when k is even. Putting x = 1, the full sum of coefficients

Create a free account to read the complete working, and practise questions like this in a timed test.

Question ID VK-115201