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Grade 11Algebra

18 points are indicated on the perimeter of a triangle .How many Triangles are there with the vertices at these points ?
Note - Each side contains 5 points in between two vertices.

Profile image of Riddhi Gupta
6 Years agoGrade 11
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1 Answer

Profile image of Arun
6 Years ago
 

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


Hope it helps

 

Regards

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