" Four cards are presented: A, B, 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."

Options

A+ odd... yes the statement is false.
A+ even...no you can't prove the statement false.

B+ odd...not germane
B+ even...not germane

4+ vowel...not germane
4+ consonant...not germane

7+ vowel...yes, the statement is false
7+ consonant...not germane.

Only one of the four cards MUST be turned over to prove the statement false.

And the answer is "A".

Not "A" and then maybe "7".
Only the "A" has to be turned over; even if turning over the "7" is needed for the proof.

Geez! I'd like to sell you guys a used car and a garage in the swamp.