If you draw straight lines in the plane consisting of parallel in one direction, parallel in different direction ... and parallel in another direction and no three of the lines meeting at a point, show that the number of intersection points is

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- Apr 30th 2009, 06:43 AMfardeen_genFind the number of intersection points?(Combinatorics)
If you draw straight lines in the plane consisting of parallel in one direction, parallel in different direction ... and parallel in another direction and no three of the lines meeting at a point, show that the number of intersection points is