In the expansion of the following expression 1+(1+x)+(1+x)^2+ +(1+x)^n, the coefficient of x^k (0 k n) is

JEE Main Mathematics question

In the expansion of the following expression , the coefficient of is

Answer: (A)

The coefficient of in is , so the required coefficient is (the terms with are ). By the hockey-stick identity,

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

Question ID VK-021140