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Formal Reasoning (Posted on 2004-12-15) Difficulty: 2 of 5
I present to you a deck of 4 cards. Each card has on one side a letter of the alphabet, and on the other side a single digit from 0-9.

I propose a hypothesis that may apply to this deck:
If the letter is 'E', then the number on the other side is '4'.

I then drop the 4 cards on the table, and you see: 'B', '7', 'E', '4' (on the respective cards).

Which of the 4 cards must you turn over to verify or disprove my hypothesis?

See The Solution Submitted by SilverKnight    
Rating: 3.0000 (22 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
answerK Sengupta2008-02-21 14:28:34
my thoughtsbrad2005-03-29 21:07:48
More thoughts on my previous answerNetGoofy2005-03-23 19:13:20
How about this.NetGoofy2005-03-23 19:05:04
Maybe?Kardo2005-03-23 06:11:47
Turn the E and 7jim jones2005-03-15 10:48:53
Turn the E and 7jim jones2005-03-15 10:48:53
No SubjectUjjawal2005-03-11 13:16:04
SolutionsolutionJeff2005-03-09 04:04:09
re(5): SolutionDustin2005-03-07 01:20:18
re(4): SolutionSean2005-03-07 00:37:42
re(3): SolutionDustin2005-03-06 23:14:23
re(2): SolutionSean2005-03-06 23:08:48
Some Thoughtsre: Solutionartemis2005-03-06 15:33:10
SolutionSolutionSean2005-03-06 08:47:21
Solutionartemis2005-03-05 17:00:38
The REAL SolutionNetGoofy2005-03-01 17:45:33
solutionaq2005-02-28 20:53:46
SolutionPossible SolutionRobyn2005-02-23 17:49:35
solutionjames2005-02-22 01:48:53
solution.Pete2005-02-10 23:30:04
SolutionCORRECTION!!!dev e.2005-02-07 02:29:12
Solutionweird...dev e.2005-02-07 02:01:08
the solutiondurrell2005-02-05 16:42:17
solutionjuan m. perez2005-02-04 22:20:48
the answerderek2005-01-19 23:46:10
re: answerjeff2005-01-19 07:41:27
answerjeff2005-01-19 07:40:08
answerCassandra2005-01-02 01:21:05
answerjenni2004-12-27 23:16:56
ANSWERSIMONE FOLK2004-12-24 19:44:14
answer???sarah2004-12-22 05:33:11
I think this is itmick2004-12-19 03:58:29
re: The Answergregory2004-12-19 01:13:19
The AnswerChris, Phd2004-12-19 00:32:11
SolutionCorrecrt Solutiondebajit2004-12-18 09:39:12
Some Thoughtssolutiondaniel2004-12-17 23:27:10
Tis the ReasonRandyOrton2004-12-17 14:38:59
SolutionSolutionRichard Carr2004-12-17 13:46:38
possible solutiontawnya2004-12-17 06:07:06
re: I don't understandPenny2004-12-17 02:13:45
I don't understandDainma Felpry2004-12-17 00:11:13
SolutionSolution by counterexamplee.g.2004-12-16 10:52:25
re: solution-and i did not steal it, promiseNosher2004-12-16 02:34:07
solution-and i did not steal it, promiseLinda2004-12-15 20:31:25
SolutionEric2004-12-15 17:23:06
Good problemSteveH2004-12-15 17:18:28
re: SolutionFederico Kereki2004-12-15 17:08:10
Solutionsolutionbob9092004-12-15 16:46:32
SolutionJoshua2004-12-15 16:24:32
re: Layman's LogicPenny2004-12-15 16:09:03
SolutionLayman's LogicJuggler2004-12-15 15:50:28
re: 3 ScenariosTimothy Bard2004-12-15 15:42:24
re: SolutionPenny2004-12-15 15:40:00
Some Thoughtsre: Is there a catch ?Federico Kereki2004-12-15 15:23:50
SolutionSolutionPenny2004-12-15 15:14:04
Solutionre: 3 Scenariosnikki2004-12-15 13:58:47
Solution3 ScenariosSyzygy2004-12-15 13:23:56
SolutionIs there a catch ?Syzygy2004-12-15 13:16:50
SolutionSolutionOld Original Oskar!2004-12-15 12:59:10
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