Questions
The number of triangles that are formed by choosing the vertices from a set of 12 points, seven of which lie on the same line is
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Correct option is D
We know, a triangle will be formed by taking three points at a time..'.Required number of triangles =12C3−7C3 =12×11×103×2×1−7×6×53×2=220−35=185Similar Questions
There arepoints in a plane, no two of which are in a straight line except 4, all of which are in a straight line. The number of triangles that can be formed by using these points is
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