Intersection Probability


There are $20$ points on a circle and all possible segments are drawn on the which two of these points are the endpoints. Two segements are choosen randomly. The probability of them intersecting is $\frac{a}{b}$. Determine $a+b$ (they could intersect on the circumference).


Geometry  


Probability  


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Attempt 30


Solve 4


First Solve rahmanistiyak6





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