A player has probability 0.4 of winning a single game. What is his
probability of winning a 'best of 15 games' tournament?
Drug Testing
Age 16 to 18 Challenge Level
It may be helpful to consider an ordering of the events, with the associated probabilities at each stage.
For example, first the athletes decide whether to take the drug or not. Then the race takes place. Then the drug testing takes place.