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If A, then B. If B, then C. If C, then D. If all of the

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Intern
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If A, then B. If B, then C. If C, then D. If all of the [#permalink] New post 31 May 2006, 06:47
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A
B
C
D
E

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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.

I am unable to decide between A and C.. OA later..
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 [#permalink] New post 31 May 2006, 08:16
I pick C.

it says

A -> D by transitivity

so if not D then not A holds.
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 [#permalink] New post 31 May 2006, 09:23
First of all I don't think you will encounter these questions in real exam. (If yes then its very rare).

But if you have time then you can go through this thread:
http://www.gmatclub.com/phpbb/viewtopic.php?t=14547

BTW answer should be C.
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 [#permalink] New post 31 May 2006, 18:28
Yes agree with C.
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 [#permalink] New post 31 May 2006, 21:07
If A --> B, then !B --> !A
If B --> C, then !C --> !B
If C --> D, then !D --> !C

Only C is true. The rest cannot be derived from the relationship given above.

(!D --> !C --> !B ---> !A, so !D --> !A)
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 [#permalink] New post 01 Jun 2006, 08:38
C is good.
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 [#permalink] New post 01 Jun 2006, 09:15
ps_dahiya wrote:
First of all I don't think you will encounter these questions in real exam. (If yes then its very rare).

But if you have time then you can go through this thread:
http://www.gmatclub.com/phpbb/viewtopic.php?t=14547

BTW answer should be C.


Thanks for the link.. yup the OA is C..
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 [#permalink] New post 02 Jun 2006, 16:58
Its clearly C
  [#permalink] 02 Jun 2006, 16:58
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