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jee king king Grade: 12
        

18 pts are indicated on the perimeter of a triangle ABC. How many triangles are there with vertices at these points?


 note: each side contains 5 points in between the 2 vertices

7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear jee


total number of triangle = 18C3


but triangle can not be formed by joing the point which are in straight line


so possible triangle = 18C3 -3* 7C3


 






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Badiuddin

7 years ago
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