A Simple Logical Puzzle That Shows How Illogical People Are

Re:A Simple Logical Puzzle That Shows How Illogical People Are by alain94040 on Friday May 22, 2015 @03:08PM (#9590335)

I would have turned the 5 card too. Why? Because it says to test the truth of the proposition. So it's saying all bets are off, whatever I told you may or may not be true. Only what you see (the table with the 4 cards) is real.

If you still assume that each of which has a number on one side and a colored patch on the other side holds, then no need to check 5. But if you focus on testing the final proposition, I'm not sure anymore of what I should assume...

Summary: poorly worded problem.

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Re:A Simple Logical Puzzle That Shows How Illogical People Are by Jtsummers on Friday May 22, 2015 @03:44PM (#9590547)

The proposition:

  Which card(s) must you turn 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?

The rest is given information, not the proposition.

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