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"Suppose you're on a game show and you are given a choice of three
doors. Behind one door is a car and behind the others are goats. You
pick a door-say No. 1 - and the host, who knows what's behind the doors,
opens another door-say, No. 3-which has a goat. (In all games, the host
opens a door to reveal a goat). He then says to you, "Do you want to
pick door No. 2?" (In all games he always offers an option to switch).
Is it to your advantage to switch your choice?"
-- The three doors problem, also known as Monty-Hall Problem
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