# math

X1, X2,...,X9 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.)

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http://mathforum.org/library/drmath/view/51708.html

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posted by Steve

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