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

A

7

B

10

C

11

D

9

Verified by Experts

The correct Answer is:

A

Put `x = 1 ,x = - 1` add divided by 2.

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