There are 7 non-collinear points. How many triangles can be drawn by joining these points?
A.35
B.10
C.8
D.7
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option A)
collinear can be formed by joining any three non-collinear points in pair's. there are 7 non-collinear points. The number of triangles formed
7C3
7*[7-1]*[7-2] / 3
7*6*5/ 3*2*1 = 7*5='35
collinear can be formed by joining any three non-collinear points in pair's. there are 7 non-collinear points. The number of triangles formed
7C3
7*[7-1]*[7-2] / 3
7*6*5/ 3*2*1 = 7*5='35
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