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There are 10 points on a circle. By connecting two of these points, a chord of the circle is formed. All together there are 45 such chords. If no three chords share a common point in the interior of the circle, find the number of intersection points among these chords inside the circle.

 Jun 5, 2022
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The number is C(10,2) = 45.

 Jun 5, 2022

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