There are 3 switches downstairs. Each corresponds to one of the three light bulbs in the attic. You can turn the switches on and off and leave them in any position. How would you identify which switch corresponds to which light bulb, if you are only allowed one trip upstairs?
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Go up to the attic once with three different light bulbs and screw them into specific sockets: left – standard white, middle – yellow and right – red. Go back downstairs and with each switch look to see what color of light is coming from the attic.
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