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."
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Options (1) and (2)

(1) Has a 80% chance of proving the statement false.

A + even number = cannot determine
A + odd number = statement false

(2) Has a 20% chance of proving the statement false

7 + vowel = statement false
7 + consonant = cannot determine

Unless you are a mindreader you MUST choose "A" first in your effort to prove that the statement in question is false.

So the answer is "A", and that's that.