How many triangles can be formed if the vertices are chosen from a set of n points all lying on a circle?

Question

I couldn't understand the question.Why the points must lie on the circle?Is the answer C(n,3)?

possible duplicate of How many triangles can be formed from N points on a circle? — , May 17 '15 at 17:05

score 3 · Accepted Answer · answered May 05 '15 at 12:22

3

Since the points all lie on a circle, no three of them can be collinear with each other. That means you don't have to worry about whether three points on the same line can be said to define a "triangle".

Your answer is correct.

answered May 05 '15 at 12:22

David K

98,388

How many triangles can be formed if the vertices are chosen from a set of n points all lying on a circle?

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