Recent content by nano Math

its nC3-mC3

the picture is related to question #2, which states of n lines, there are m parallel lines. assuming n is composed of (n-m) non parallel lines and m parallel lines

i am assuming it might be of form but i see m*(nC3) doesn't work here. here there are 4 triangles. can anyone please provide insight

Homework Statement 1. Given n non-parallel lines such that no three intersect in a point, determine how many triangles are formed? 2. Given n lines in total, of which m are parallel, how many triangles are formed? Homework Equations Combination nCr (n choose r) The Attempt at a...