A) 2n+1
B) \[{{n}^{2}}\]
C) \[2{{n}^{2}}-1\]
D) \[2{{n}^{2}}\]
Correct Answer: B
Solution :
[b] Upon setting n=1, options (2) and (3) give 1. Upon setting n=2, option (3) gives, 7. Hence the answer is (2).
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