A) \[\frac{2{}^{n}{{C}_{2}}}{{}^{({}^{n}{{C}_{2}}-n)}{{C}_{2}}}\]
B) \[\frac{^{n(n-1)}{{C}_{2}}}{{}^{({}^{n}{{C}_{2}}-n)}{{C}_{2}}}\]
C) \[\frac{^{n}{{C}_{4}}}{{}^{({}^{n}{{C}_{2}}-\,n)}{{C}_{2}}}\]
D) none of these
Correct Answer: C
Solution :
[c] When 4 points are selected, we get one intersecting point. So , probability is \[\frac{^{n}{{C}_{4}}}{^{{{(}^{n}}{{C}_{2}}-n)}{{C}_{2}}}\]
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