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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: ( You must be logged in to post comments.)
  Subject Author Date
re: a better solution is a better problempcbouhid2005-10-15 14:11:32
Some Thoughtsa better solution is a better problemtanx2005-10-15 02:06:40
re: good puzzlepcbouhid2005-10-02 17:39:33
good puzzleignatious2005-10-02 08:50:46
re: guesspcbouhid2005-09-22 22:09:34
guesssmarty2005-09-22 19:49:00
re: Hope this solution is correct!pcbouhid2005-09-20 12:51:33
SolutionHope this solution is correct!rs2005-09-20 09:54:45
To make it easy, he should....LORENA2005-09-13 04:11:46
Pikapp307's RazorCharlie Roberts2005-09-12 18:12:40
re: another solutionpcbouhid2005-09-11 23:00:13
another solutionsf2005-09-11 07:01:01
A Long SolutionDhanasekar2005-09-10 13:18:03
Solutionok now i go it from haruki's help (kinda)Jordan Manavian2005-09-10 06:52:07
Just a noteHaruki2005-09-10 02:55:26
First time member guessJordan Manavian2005-09-09 23:30:11
re: here's a guesspcbouhid2005-09-09 20:29:39
here's a guessStephen2005-09-09 19:02:32
re(3): Long tedious solutionKC2005-09-09 06:26:18
re(2): Long tedious solutionpcbouhid2005-09-08 17:28:15
re: Long tedious solutionAvin2005-09-08 17:04:31
SolutionLong tedious solutionTan Kiat Chuan2005-09-08 04:58:16
re: Questionpcbouhid2005-09-08 04:16:54
QuestionQuestionBender2005-09-08 03:55:33
re: Not the standard logicpcbouhid2005-09-07 17:11:27
SolutionNot the standard logicLeming2005-09-07 16:43:08
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