A) 7
B) 9
C) 12
D) 11
E) None of these
Correct Answer: C
Solution :
Explanation Option (c) is correct. \[\frac{n\,(n-3)}{2}={{54}^{{}^\circ }}\Rightarrow {{n}^{2}}-3n={{108}^{{}^\circ }}\Rightarrow n=12\]
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