Question
Let $\left(1+x^{2}\right)^{2}(1+x)^{n}=\sum_{k=0}^{n+4} a_{k} x^{k}$. If $a_{1}, a_{2}, a_{3}$, are inA.P., then $n$ is equal to(A) 1(B) 2(C) 3(D) 4
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