9 points are marked on a straight line and another 10 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 answer:
A) 91 B) 105 C) 196 D) 27 E) 14
assuming that the top line can have either 2 points or 1 point...   9! / 1!8! - 9! / 2! 7! yields 27.   27
<result>D</result>
9 points are marked on a straight line and another 10 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?