Quote Originally Posted by Gizmokid2005 View Post
You are standing in front of a room with one lightbulb inside of it. You cannot see if it is on or off. Outside the room there are 3 switches in the off positions. You may flip the switches any way you want to. You stop flipping the switches, enter the room and know which switch controls the lightbulb. How?
ANSWER (Congrats Mathster): You turn 2 switches "on" and leave 1 switch "off" and wait about a minute. Then enter the room, but just before you enter, turn one switch from "on" to "off". Once in the room, feel the lightbulb - if it is warm, but off, it has to be the last switch you turned off. If it is on, it has to be the switch left on. If it is cold and is off, it has to be the switch you left in the off position.

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