You are standing in front of a room with one light bulb
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
turn the switches any way you want to. You stop turning
the switches, enter the room and know which switch
controls the light bulb. How?
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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.
hope this correct
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