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Let (1+x^2)^2 . (1+x)^n = Sigma(k=0)^(n+...

Let `(1+x^2)^2 . (1+x)^n = Sigma_(k=0)^(n+4) (a_k).x ^k "if" a_1,a_2 & a_3` are in AP find n

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The correct Answer is:
n=2 of 3 or 4
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