Let (1+x+2x^2)^ 20 =a_0+a_1x+a_2x^2+ +a_ 40 x^ 40 . Then a_1+a_3+a_5+ +a_ 37 is equal to

JEE Main Mathematics question

Let . Then is equal to

(A)Correct
(B)
(C)
(D)

Answer: (A)

Solution

With , and , so the sum of all odd-indexed coefficients is . The odd-indexed coefficients run up to , which is obtained by taking from factors and from the

See the full step-by-step solution

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

Create a free account

Question ID VK-021328