A brainteaser regarding probability, in which a game showcontestant picks a door to win a prize. One door conceals a car; the other two conceal goats. After the contestant picks a door, the host opens one of the two remaining doors which reveals a goat. Counterintuitively, it is then in the contestant's interests to switch to the remaining door.
Origin
Named after Monty Hall, former host of the American television game show Let's Make a Deal.
Modern English dictionary
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