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?

None. If you see B, 7, E, & 4 on the table you just disproved your hypothesis.  E AND 4 would not be showing if the hypothesis were true.

Posted by bob909 on 2004-12-15 16:46:32