If the coefficient of a^7b^8 in the expansion of (a+2b+4ab)^ 10 is K 2^ 16 , then K is equal to

JEE Main Mathematics question

If the coefficient of in the expansion of is , then is equal to

Answer: 315

A term is with , -exponent and -exponent . These give , and , so

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

Question ID VK-021375