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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)

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The REAL Solution | Comment 44 of 60 |

You must flip over the "7", because we can make the assumption that the hypothesis is based on the letter "E" having "4" lines.  Therefore, by flipping the "7" this would verify, or disprove this theory.

Example:
A has 3 lines
B has 3 lines

No alphabetical character exceeds more than 4 lines....

 


  Posted by NetGoofy on 2005-03-01 17:45:33
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