1000 CR - Query

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Forum Index GMAT Verbal & Essays Critical Reasoning
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Sharad.Inc
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Topic: 1000 CR - Query
PostTue Apr 17, 2007 4:18 am
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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
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PostSun May 13, 2007 9:11 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").

???
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