A) 15
B) ? 15
C) 0
D) 51
Correct Answer: C
Solution :
As we know that \[^{n}{{C}_{0}}-{{\,}^{n}}C_{1}^{2}+{{\,}^{n}}C_{2}^{2}-{{\,}^{n}}C_{3}^{2}+...+{{(-1)}^{n}}.{{\,}^{n}}C_{n}^{2}=0\], (if n is odd) and in the question n=15 (odd).
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