Three straight lines and are parallel and lie in the same plane. Five points are taken on each of and . The maximum number of triangles which can be obtained with vertices at these points, is
425
405
415
505
The total number of points is 15 . From these 15 points we can obtain triangles. However, if all the 3 points are chosen on the same straight line, we do not get a triangle. Therefore, the required number of triangles
.
Study 40% syllabus and score up to 100% marks in JEE