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Given(1+x^2)^2 (1+x)^n = sum ar x^r. If ...

Given`(1+x^2)^2 (1+x)^n` = `sum a_r x^r`. If `a_0,a_1 and a_2` are in A.P. then value of n can be:

A

n = 2 or 3

B

n = 2 only

C

n = 3 only

D

n = 5, n = 6

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The correct Answer is:
A
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