Question 1175135: five cards are lying on a table. each card has a natural number on each of its
two faces. pete said if a non prime is on one side of a card, then an odd
number is on the other side. wilbur proved pete wrong by turning over one card.
which card was it?
(the cards and faces shown are 2, 3, 5, 7, 11)
Answer by Edwin McCravy(20062)   (Show Source):
You can put this solution on YOUR website!
I think you did not post all of the problem. I think the trick has to do with
the fact that all primes are odd except the first one, which is 2. So you can
use that fact to fool a person who erroneously thinks all primes are odd.
Edwin
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