If (1+x-2x^ 2 )^ 8 =a_0+a_1x+a_2x^2+ +a_ 16 x^ 16 then the sum a_1+a_3+a_5+ +a_ 15 is equal to

JEE Advanced Mathematics question

If then the sum is equal to

Answer: (A)

Let . Then .

Create a free account to read the complete working (2 steps), and practise questions like this in a timed test.

Question ID VK-108342