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Wednesday, May 25, 2011

There are four cards lying on the table. In order, the cards show: E V 2 7. Each card has a digit on one side and a letter on the other side.

Which cards should you turn around to test the following statement: "when there is a vowel on one side of a card, then there is an even digit on the other side"?
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8 comments:

  1. Endothief5/25/2011 8:38 AM

    E and 2 obviously.

    ReplyDelete
  2. Anonymous5/25/2011 11:00 AM

    E and 7

    ReplyDelete
  3. Anonymous5/25/2011 12:24 PM

    E,2,and 7

    ReplyDelete
  4. Seema5/26/2011 3:52 AM

    E

    ReplyDelete
  5. Anonymous5/26/2011 5:25 PM

    E and 2

    ReplyDelete
  6. Anonymous5/29/2011 10:15 AM

    E satisfies the condition; turn that card over to verify the conclusion.
    V contradicts the condition; the other side of the card tells us nothing useful about the conclusion.
    2 satisfies the conclusion; the other side of the card tells us nothing useful about the condition (the statement does not claim that only vowels have even digits on the other side).
    7 contradicts the conclusion; turn that card over to contradict the condition.

    ReplyDelete
  7. ashirwaad-holiday-apts-goa5/31/2011 5:55 AM

    I think it's E and 2.
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    ReplyDelete
  8. Unknown5/31/2011 8:32 AM

    Only two of the cards make a difference, the E and the 7. Flip over the E to see if there is an even digit on the other side. If not, you have a contradiction.

    Flip over the 7 to see if there is no vowel on the other side. If there is a vowel on the other side, the statement is not true.

    ReplyDelete

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