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Logical, or not? (Posted on 2015-06-01) Difficulty: 2 of 5
The Wason Card Problem is a well known test in the study of deductive reasoning.

You are given 4 cards, two face up and two face down; say, 3,8, Red, Brown, and asked which card(s) must be turned over in order to test the truth of the proposition that if a card shows an even number on one face, then its opposite face is Red?

Apparently only a small percentage of those tested give the 'correct' solution - although the 'great majority of subjects agree with the logic of the solution, once it is explained to them'.

The 'correct' solution is given in the article, but it is worth attempting to solve it first, if you are not already familiar with it.

Question: Why is the 'correct' solution in fact questionable?

See The Solution Submitted by broll    
Rating: 3.0000 (2 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Some Thoughts re: solution | Comment 2 of 4 |
(In reply to solution by Charlie)

I wanted to communicate this fact to broll,- the reason for the ambiguity was that that original Wason's experiment was performed (and so described) with regular playing cards, which broll , willy nilly, did not mention.

In the seventies I was shown the trick, where the spectator, after providing the "correct" solution, i.e. 8 and RED in our case, gets the surprise of his life:  the asker  turns over the "3" card and a picture of Satan appears  with the number 666 next to him...

  Posted by Ady TZIDON on 2015-06-01 12:51:54
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