There are points in a plane such that no three of them are in the same line except five points which are collinear. The number of triangles formed by these points is :
Find the number of triangles formed based on given information
Given, points five of them are collinear.
We need three non-collinear points to form a triangle.
The number of triangles formed by points is
Since points are collinear.
Therefore, the number of triangles is
Hence, option (B) is correct .