Choose a door. After one empty door is revealed, click your final choice (same door to stay, different door to switch).
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This probability puzzle is based on the TV game show "Let's Make a Deal." The counterintuitive result is that you have a 2/3 chance of winning if you switch doors after one is revealed, but only a 1/3 chance if you stay with your initial choice.
Play several games and track your results to see the probabilities emerge!