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?

Turn over the E to check if it has a 4 on the other side.
Turn over the 7 to check if it doesn't have an E on the other side.

Posted by Old Original Oskar! on 2004-12-15 12:59:10