If the sum of coefficients of all even p...

If the sum of coefficients of all even powers in the expansion of `(1 + x + x^(2) + ….x^(2n))^(2)` is 221. Then the value of n is

A

7

B

10

C

11

D

9

Verified by Experts

The correct Answer is:

B

Put x = 1, x = -1 add and divided by 2

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