Q: Three ants are at different corners of a triangle. They start walking down an edge at the same time. What are the odds they will not run into each other before they reach the next corner?

A: Each ant has two ways to go, so there are 2^3 = 8 possible ways they can walk. They will not run into one another if they all go clockwise or counterclockwise, so there are two ways they can avoid each other. The odds are 2 : 8 or 1 : 4.