Wednesday, January 6, 2010

Puzzle from Keith (where does HE get them?)

You are in a windowless room with 3 switches which correspond to 3 bulbs in another room and you don't know which switch corresponds to which bulb. You can only enter the room with the bulbs once. You can not use any external equipment (power supplies, resistors, etc.). How do you find out which bulb corresponds to which switch?

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