There are 10 points in a plane, no three of which are in the same straight line,excepting 4 points ,which are collinear.Find the (i)number of straight lines obtained from the pairs of these points (ii)number of triangles that can be formed with the vertices as these points..Explain with diagram

the number of straight lines from the given points are

(ii)
the number of triangles formed with non collinear points are ${}^{6}\mathrm{C}_{3}$

hope this helps you

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