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Five red discs (Posted on 2005-09-07) Difficulty: 3 of 5
Paul shows nine colored discs (five red, two blue and two green) to five logicians.

After blindfolding them, Paul picks up the five red discs, sticks one on the forehead of each logician, and hides the other discs elsewhere. After removing the blindfolds, everyone sees the discs (all red) on the others' foreheads but not the one on his own.

After a few minutes, one of the logicians (that reasons a little faster than the others) correctly states the color of his disc. How does he work it out?

See The Solution Submitted by pcbouhid    
Rating: 4.0833 (12 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: guess | Comment 22 of 26 |
(In reply to guess by smarty)

very SMARTY!
  Posted by pcbouhid on 2005-09-22 22:09:34

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