Dots In A Circle

There are 40 dots spaced evenly in a circle. If 4 distinct dots \(W, X, Y\) and \(Z\) are picked randomly, what is the probability that \(WX\) intersects \(YZ\)?

If the probability can be expressed as \( \dfrac ab\), where \(a\) and \(b\) are coprime positive integers, find \(a+b\).

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