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Let(1+X^(2))^(2)(1+X)^(n)=sum(k=0)^(n+4)...

Let`(1+X^(2))^(2)(1+X)^(n)=sum_(k=0)^(n+4)a_(k)X^(k).ifa_(1),a_(2),a_(3)` are in arithmetic progression then possible value (s) of n is/are :

A

5

B

4

C

3

D

2

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The correct Answer is:
B, C, D
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