A) 72
B) 153
C) 306
D) 2556
Correct Answer: B
Solution :
Given \[{{\,}^{n}}{{C}_{12}}={{\,}^{n}}{{C}_{6}}\] \\[12+6=n\Rightarrow n=18\] \\[^{18}{{C}_{2}}=\frac{18\times 17}{2}=9\times 17=153\].
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