A) \[{{(-1)}^{n/2}}\,(n+1)\]
B) \[{{(-1)}^{n}}\,(n+1)\]
C) \[{{(-1)}^{n/2}}\,(n+2)\]
D) \[{{(-1)}^{n}}\,(n+2)\]
E) None of these
Correct Answer: C
Solution :
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