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by shovan85 » Fri Dec 03, 2010 11:52 pm
Night reader wrote:How many distinct triangles could be drawn using as their vertices three of the vertices of a regular hexagon?

(A) 6
(B) 12
(C) 15
(D) 20
(E) 30
IMO D

In a hexagon none of the 3 points are co-linear so we do not have to subtract anything.

Thus, C(6,3) = 20.
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