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 Posted: Sat Sep 04, 2010 2:22 pm
I didn't see this one here so I figured I might as well add it to your collection.
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 light bulb. How?
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Posted: Sat Sep 04, 2010 5:08 pm
Flip one switch, leave it on for a minute, then flip it off. Then flip another on and enter. If the light's on, it's the one you left on, if it's off, touch it. If it's hot it was the first one, if not the one you left alone.
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Posted: Sun Sep 05, 2010 4:58 am
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