Questions
There are 10 points in a plane, out of these 6 are collinear. The number of triangles formed by joining these points, is
detailed solution
Correct option is A
A triangle is obtained by joining three noncollinear points. So number of triangles on joining 3 points out of 10 points =.
But, 6 points are collinear and on joining any three out of these 6, we do not obtain a triangle .
Hence, the required number of triangles
.
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