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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 turn the switches
any way you want to. You stop turning the switches, enter the room and
know which switch controls the lightbulb.
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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