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1000 CR - Query

This topic has 2 member replies
Sharad.Inc Newbie | Next Rank: 10 Posts Default Avatar
Joined
16 Apr 2007
Posted:
1 messages

1000 CR - Query

Post Tue Apr 17, 2007 3:18 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    If A, then B.
    If B, then C.
    If C, then D.
    If all of the statements above are true, which of the following must also be true?
    (A) If D, then A.
    (B) If not B, then not C.
    (C) If not D, then not A.
    (D) If D, then E.
    (E) If not A, then not D.

    Why is the answer C and not B ?

    Thanks in advance !

    S

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    bww Senior | Next Rank: 100 Posts Default Avatar
    Joined
    29 Apr 2007
    Posted:
    55 messages
    Thanked:
    1 times
    Post Sun May 13, 2007 8:11 pm
    something with contrapositives?

    "If A, then B" corresponds to "If not B, then not A." It is not "If not A, then not B." ??

    Thus, "if not D, then not A" adheres. "If not B, then not C" does not follow the same logic (it would be "if not C, the not B").

    ???

    Post Fri Sep 22, 2017 7:47 pm
    If A, then B. which can also be interpreted as (if not B, then not A).
    Both B and C are wrong.
    I think this follows the Alphabet sequence. Hence, option D will be considered by me as the right option.

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