Posted by please help on Monday, January 14, 2013 at 8:18pm.
Draw a circle, form as many triangles as you can, and count.
ok i tried that that its hard why dont u try and tellme the answer ?
You have 6 points on a circle.
It is not possible to have 3 of them forming a straight line (not a triangle) so the question becomes how many choices are there of 3 elements form 6
or C(6,3) = 6!/(3!3!) = 20
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