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^kdotIfa_1,a_2a n d a_3` are in arithmetic progression, then the possible value/values of `n` is/are a. 5 b. 4 c. `3` d. `2`

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