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$X_1, X_2,\ldots,X_9$ are nine points on the circumference
of circle $O$. Line segments are drawn connecting each pair of points.

What is the largest number of different points inside the circle
at which at least two of these line segments intersect? (Remember that the
points are not necessarily evenly spaced around the circle.)

 Mar 29, 2015
 #2
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Oh! Thanks CPhill! It is greatly appreciated

 Mar 29, 2015

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