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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 iun `AP` , find n.

A

6

B

5

C

7

D

2,3,4

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The correct Answer is:
D
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