You should turn over A and 7. Firstly, you should turn A to check if an even number is on the back. Secondly, you should turn over 7 to check if there is a vowel on the back. If there is, then the claim must be false. $$ $$ You do not need to turn over 6, because the claim cannot be proven or disproven by turning over the card. Even numbers could have either vowels or consonants on the back without the claim being disproven.