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You are in a house on the first floor, with 3 light switches. On the floor above you there are 3 lights. You can only go upstairs one time and back down. How do you find out which light switch goes to what light on the floor above you.
you cannot go outside and look through the window, cannot go half way up the stairs and see any of the lights. Cannot peak your head up the stairway and be able to see any of the lights.
Turn on 1 switch , wait five mins...turn it off and turn another on, go upstairs and the bulb which is on is obvious, the bulb which is off but warm is the fist switch and the cold bulb is the untouched switch.