Let (1+x^2)^2(1+x)^n=sum(k=0)^(n+4)ak x^...

Let `(1+x^2)^2(1+x)^n=sum_(k=0)^(n+4)a_k x^k`. If `a_1`, `a_2` and `a_3` are in arithmetic progression, then the possible value/values of `n` is/are a. 5 b. 4 c. `3` d. `2`

A

5

B

4

C

3

D

2

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The correct Answer is:

B, C, D

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