A) 12
B) 4 only
C) \[-3\]only
D) 4 or \[-3\]
Correct Answer: D
Solution :
\[^{{{n}^{2}}-n}{{C}_{2}}{{=}^{{{n}^{2}}-n}}{{C}_{10}}{{\Rightarrow }^{{{n}^{2}}-n}}{{C}_{{{n}^{2}}-n-2}}{{=}^{{{n}^{2}}-n}}{{C}_{10}}\] \[\Rightarrow {{n}^{2}}-n-2=10\] or \[n=4,\ -3\].You need to login to perform this action.
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