There are three lights in a room and three switches in another room that control them. You cannot see the lights from the switch room. How can you tell what switch goes to what light?
Anonymous
Turn on one light for a long time, then turn it off and turn on one of the other remaining two. Immediately go to the other room. The light that is on is related to the switch that you flipped on before moving to the room. Touch the other two bulbs now, the one that is hot is the one you first turned on and left on for a while, the cold one is the switch you never touched.
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