[Leo99]

I always remember the colored balls in the bag problems. 5 red balls, 3 blue balls. What the p you pull out a blue bal? What's the p you pull out 2 blue balls? What's the p you pull out 2 balls and exactly one is blue? What's the p you pull out 2 balls and at least one is blue? Pull out a ball, look at it, put it back in the bag. Do that 100 times. How many blue balls would you expect to see?

I don't know of any cooler contexts than that [img]/images/graemlins/crazy.gif[/img]