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Math Help - card problem

  1. #1
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    card problem

    I would appreciate if you can solve this problem.


    Each of the cards shown below has a number on one side and a letter on the other. How many of the cards must be turned over to prove the correctness of this statement for these cards: "If a card has a vowel on one side, then it has a prime number on the other side" ?


    [ A ] [ B ] [ C ] [ 3 ] [ 4 ] [ 5 ]
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  2. #2
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    Quote Originally Posted by chil2e View Post
    I would appreciate if you can solve this problem.
    Each of the cards shown below has a number on one side and a letter on the other. How many of the cards must be turned over to prove the correctness of this statement for these cards: "If a card has a vowel on one side, then it has a prime number on the other side" ?
    [ A ] [ B ] [ C ] [ 3 ] [ 4 ] [ 5 ]
    Why don't you solve it for yourself.

    I will play the part of the 'back-of-the-book".
    The answer is two.
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  3. #3
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    Hello, chil2e!

    The problem is not clearly stated.


    Each of the cards shown below has a number on one side and a letter on the other.
    How many of the cards must be turned over to prove the correctness of this statement:
    "If a card has a vowel on one side, then it has a prime number on the other side" ?

    . . [\,A\,]\quad[\,B\,]\quad[\,C\,]\quad[\;3\;]\quad[\;4\;]\quad[\;5\;]

    The cards are to be "turned over".

    Does this mean each card has one side already visible?

    If so, which sides are visible?
    . . The letters? .the numbers? .a random mix?

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