6 points are marked on a straight line and another 7 points are marked on a second straight line ...

6 points are marked on a straight line and another 7 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?

Quiz

Answer/Solution

281

Steps/Work

Solution: select 2 from 6 and one from 7 + select 2 from 7 and 1 from 6
6C2*7C1 + 7C2*6C1
= 281
Answer : B