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 Five red discs (Posted on 2005-09-07)
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)

 Subject Author Date re: a better solution is a better problem pcbouhid 2005-10-15 14:11:32 a better solution is a better problem tanx 2005-10-15 02:06:40 re: good puzzle pcbouhid 2005-10-02 17:39:33 good puzzle ignatious 2005-10-02 08:50:46 re: guess pcbouhid 2005-09-22 22:09:34 guess smarty 2005-09-22 19:49:00 re: Hope this solution is correct! pcbouhid 2005-09-20 12:51:33 Hope this solution is correct! rs 2005-09-20 09:54:45 To make it easy, he should.... LORENA 2005-09-13 04:11:46 Pikapp307's Razor Charlie Roberts 2005-09-12 18:12:40 re: another solution pcbouhid 2005-09-11 23:00:13 another solution sf 2005-09-11 07:01:01 A Long Solution Dhanasekar 2005-09-10 13:18:03 ok now i go it from haruki's help (kinda) Jordan Manavian 2005-09-10 06:52:07 Just a note Haruki 2005-09-10 02:55:26 First time member guess Jordan Manavian 2005-09-09 23:30:11 re: here's a guess pcbouhid 2005-09-09 20:29:39 here's a guess Stephen 2005-09-09 19:02:32 re(3): Long tedious solution KC 2005-09-09 06:26:18 re(2): Long tedious solution pcbouhid 2005-09-08 17:28:15 re: Long tedious solution Avin 2005-09-08 17:04:31 Long tedious solution Tan Kiat Chuan 2005-09-08 04:58:16 re: Question pcbouhid 2005-09-08 04:16:54 Question Bender 2005-09-08 03:55:33 re: Not the standard logic pcbouhid 2005-09-07 17:11:27 Not the standard logic Leming 2005-09-07 16:43:08

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