FACT: Each card has a number on one side and a letter on the other.
HYPOTHESIS: Every card that has a vowel on one side has an even number on its opposite side.
THE TEST: Which card or cards must you turn over in order to test the Hypothesis?

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The 15 possible answers are:
All four cards: A B C D
Three cards: A B C / A B D / A C D / B C D
Just two cards: A and B / A and C / A and D / B and C / B and D / C and D
Just one card: Card A only / Card B only / Card C only / Card D only
A and C
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I take that back, all four cards
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Want to try again? 🙂
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Just two cards: A and C
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you will need to flip 2 cards. B and C. B needs to be an even number when flipped and C needs to be a vowel when flipped in order to prove the hypothesis.
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A and C
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It just cards A and C
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Card C, Card A, Card D, Card B
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Just A and C
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All Four
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just A and C
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Cards B and C
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you will need to flip 2 cards. A and C. A needs to be an even number when flipped and C needs to be a vowel when flipped in order to prove the hypothesis.
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A and C
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a and c
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All of the cards
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Huh. Nobody said A and D.
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Card A and Card D
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(E and 3)
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