you are in a room with three light switches, each of which controls one of the three light bulbs in the next room. You need to determine which switch control which bulb. All lights are iff to begin and you can't see into one room from another.You can inspect the other room only once. How can you find out which switches are connected to which bulb.
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Switch on switches 1 & 2, wait a moment and switch off number 2. Enter the room. Whichever bulb is on is wired to switch 1, whichever is off and hot is wired to switch number 2, and the third is wired to switch 3. Obviously any combination would work.
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