Given (1-2x+5x^2-10x^3 )(1+x)^n=1+a_1x+a_2x^2+ and that a_1^2=2a_2 then the value of n is

JEE Main Mathematics question

Given and that then the value of is

Answer: 6

Only the terms of the first factor affect and : and . gives , i.e.

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

Question ID VK-021158