Grix
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- Dec 9, 2008
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Here's a very hard logic riddle, can anyone solve it? (No googling! :tsk
The riddle is: How many times must the lights be turned off before there are no logicians left in the room? (There is a real answer, it's not infinity)
Anyone up for the challenge? If you have heard it before or if you couldn't stop yourself from googling it, please don't spoil the answer..
- So basically you have 50 perfect logicians in a room. All of their foreheads are painted red. They know that the others in the room are perfect logicians as well.
- The logicians does not know what color their own forehead is painted, but can see the foreheads of all the other logicians.
- They have all been told that at least one of them has a red-painted forehead.
- They cannot communicate in any way.
- After a while the lights are turned off, and they are told that if you know for sure that your forehead is painted red, you must leave the room when the lights are off. Then the lights are turned on and off again until there are no logicians left in the room.
The riddle is: How many times must the lights be turned off before there are no logicians left in the room? (There is a real answer, it's not infinity)
Anyone up for the challenge? If you have heard it before or if you couldn't stop yourself from googling it, please don't spoil the answer..
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