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| A set of four 3x5 cards is dealt on a
table |
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| as shown above.
Each card has a letter |
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| on one side and a
number on the other. |
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| The dealer proposes that these 4 cards
satisfy the rule: |
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| “If there is a vowel on one side of the
card, |
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| then
there is an odd number on the other.” |
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| What is the smallest number of cards you
have to turn |
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| over to be sure
the rule is satisfied? Which ones? |
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| 18 |
