In the expansion of (1+ax)^n, the first three terms are respectively 1, 12x and 64x^2. What is n equal to?

NDA 2019 Mathematics question

In the expansion of , the first three terms are respectively 1, and . What is n equal to?

Answer: (B)

and . Substituting :

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

Question ID VK-035367