Question
How many triangles can be formed by joining the vertices
of an hexagon?Solution
To find how many triangles can be formed from a hexagon's vertices:  A hexagon has 6 vertices.  A triangle needs 3 vertices.  The number of ways to choose 3 vertices out of 6 is given by combinations: [C(6, 3) = {6!}/{3! x 3!} = 20 Hence, 20 triangles can be formed.
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