You are in a house with a control room and a room with three light bulbs. In the control room there are three light switches matching the three bulbs. However from the control room you cannot see the light bulbs. Is there a way to find which switch matches which bulb when you cannot reenter the control room after going th the light bulb room?
Extra Challenge: explain how in the solution box.
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The way I solved it was by turning the first bulb on for 10 minutes before turning it off. Then I left the second bulb off and the third bulb on before leaving the room. In the lightbulb room the first switch connected to the bulb that was warm but turned off. The second connects to the bulb that's cold but off. Leaving the third to be connected to the bulb that is on.