8 points are marked on a straight line and another 9 points are marked on a second straight line with no points in common. How many triangles can be constructed with vertices from among the above points? Choose the correct choice:
A) 91  B) 105  C) 196  D) 20  E) 14
assuming that the top line can have either 2 points or 1 point...   8! / 1!7! - 8! / 2! 6! yields 20.   20
<result>D</result>
8 points are marked on a straight line and another 9 points are marked on a second straight line with no points in common. How many triangles can be constructed with vertices from among the above points?