Stick or Switch

This probability game is an electronic version of the old TV game show Let's Make a Deal, hosted by Monty Hall.

Behind one of the doors is a grand prize, the other two doors lead to some real losers. To play the game, select a door by clicking on it. "Monty" then reveals what is behind one of the two doors that you didn't open. You are then given the option to stick with your original selection or switch to the other door.

The game can be played repeatedly with the results updated on the scoreboard. Try experimenting with the two strategies to decide which is best.

Clicking on Strategy leads to a series of questions whose answers will help explain the probability of winning with each strategy.

To play a large number of games in a row, click on Multiple Games, select a strategy, enter the number of games, and click Go.