Four cards are placed face down. Each card has a letter on one side and a number on the other.
The rule is: “If a card has a vowel on one side, it must have an even number on the other side.”
You can see: A — K — 4 — 7



Which cards must you turn over to check whether the rule is broken?

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• A A and 4
• B A and 7
• C K and 4
• D K and 7

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Answer: B. A and 7

Turn A to check that its other side is even, and 7 to make sure its other side is not a vowel. K and 4 cannot violate the rule.

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