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: Red Green Yellow Blue
Three cards: Red Green Yellow / Red Green Blue / Red Yellow Blue / Green Yellow Blue
Just two cards: Red and Green / Red and Yellow / Red and Blue / Green and Yellow / Green and Blue / Yellow and Blue
Just one card: Red Card only / Green Card only / Yellow Card only / Blue Card only