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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

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

Grade:12

1 Answers

Badiuddin askIITians.ismu Expert
148 Points
12 years ago

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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