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I have a circle with N points on it, and I want to determine how many triangles can be formed using these points.

How can I do this?

Thanks!

Andrew

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    The vertices of those triangles have to be from these $N$ points, right?2012-10-03
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    @PatrickLi Yes - that is right.2012-10-03
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    The question is unclear. What's the relevance of the points being on a circle ? Please show an example figure and pinpoint the triangles that should be counted.2016-03-31

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