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If A, then B. If B, then C. If C, then D. If all of the [#permalink]
 31 Aug 2005, 09:17
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0% (00:00) correct
 0% (00:00) wrong based on 1 sessions
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.
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both B and E are looking good to me.
i will go for B (the closest one)
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Senior Manager
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B,
if B then C is the same as if not B then not C
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C it is
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i think B is closest.
_________________
It's not over until it's OVER!
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"C"
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Manager
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It is C.
A -> B
B -> C
C -> D
THerefore by transitive property If A, then D (A -> D)
Its contrapositive is if not D, then not A (~D -> ~A)
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nice explanations husker,
wew.., ywilfred, simple one looks tougher, atleast for me. 
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Senior Manager
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huskers is saying
A -> B
B -> C
C -> D
THerefore by transitive property If A, then D (A -> D)
Its contrapositive is if not D, then not A (~D -> ~A)
---------------------------------------------------------
I don't understand this solution.
There's no connection between A and D.
And what's transivitive property?
What's the logic.
Can the 3 lines above be written as
A->B->C->D
Then it's quite obvious that A->D
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Senior Manager
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It is C.
The argument says A is a subset of B, B a subset of C and so on. If you were to draw a Venn diagram, it is apparent that it shud be C.
GA
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ahh, i see, thanks qandy for explaining.
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Yes, OA is C.
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GMAT Club Legend
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naattamai wrote: nice explanations husker, wew.., ywilfred, simple one looks tougher, atleast for me. HI Naatamai, welcome to the GMAT club! Do not worry if this one feels tough, in a few weeks time, you will think it's simple too! When I saw this question, I got a feeling I just got to post it. It's the basics of most logic CR questions. You can read more on those by reading Honghu's sitcky on logic CRs in this forum.
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Thanks for the directions ywilfred.
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Answer is C... simple logic!
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