Quote:

Four cards are presented: A, D, 4, and 7. There is a letter on one side of each card and a number on the other side. Which card(s) must you turn over to determine whether the following statement is false? "If a card has a vowel on one side, then it has an even number on the other side."

question: why would you interpret this to suggest that there are more than four cards?

suggested answer: to further muddy the situation, and to further muddy the situation only.



Why would you assume that there are only four cards?

But irregardless of whether or not there are or aren't only four cards or not, only by the turning over of A and 7 do you have a hope of disproving the hypothesis.