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  • There are 15 points in a plane, no two of which are in a straight line except 4 , all of which are in a straight line. The number of triangles that can be formed by using these 15 points is<div

There are 15 points in a plane, no two of which are in a straight line except 4 , all of which are in a straight line. The number of triangles that can be formed by using these 15 points is

Option: 1

404


Option: 2

415


Option: 3

451


Option: 4

490


Answers (1)

best_answer

The required number of triangle is

\mathrm{{ }^{15} C_{3}-{ }^{4} C_{3}=455-4=451}

Posted by

vinayak

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