Question

if one of two parallel lines has 7 points on it and the other has 8, how many unique triangles can be drawn using the points?

Answer 1

Answer:

choose  one vertex[7] from first line and two vertices[8C2] from second line

and

choose  one vertex[8] from second  line and two vertices[7C2]  from first  line

Step-by-step explanation:

7x 8C2 + 8 x 7C2  = 7x8x7/2  + 8x7x6/2

                              =7 x4x7 +8x7x3

                              =196 +168

                              =364