ENEM wrote:

what does 'no three of the points in S are collinear' mean?

Also is this really a sub 600 level question? Shouldn't it be at least 600-700 level?

"Collinear" means lying on the same straight line.

3 points are collinear when you can draw a line that passes through all 3 of them. If this happens, the three points cannot make a triangle.

Note that you can always draw a line with any two points by just joining the 2 points.

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Karishma

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