PUZZLEBOXX
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PUZZLEBOXX |
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You are standing outside a windowless room in which there are three light bulbs. The light bulbs are connected to three switches - which are on the outside wall of the room. You have to find out which switch lights up which bulb. The door of the room is closed. You are only allowed to enter the room once and you are not allowed to prop open the door. How can you find out which switch operates which light bulb?
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