In a n-sided regular polygon, the probability that the two diagonal chosen at random will intersect inside the polygon is

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2nC2 nC2−nC2

C2 n(n−1)C2 nC2−n

nC4 nC2−nC2

none of these

answer is C.

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Detailed Solution

When 4 points are selected, we get one intersecting point.So, probability is nC4 nC2−nC2

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