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Logic question

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Manager
Manager
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Joined: 18 May 2007
Posts: 56
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Logic question [#permalink] New post 23 Jan 2008, 08:56
Premises:

(1) A, only if B
(2) Only C is B
(3) C, if and only if D.

Conclusions:

(1) If D, then B
(2) If not D, then not A
(3) If A, then not C

Which one of the conclusion is right?
Director
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Joined: 01 Jan 2008
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Re: Logic question [#permalink] New post 23 Jan 2008, 09:28
A -> B -> C <=> D
not A <- not B <- not C <=> not D

if not D then not A is the correct answer.
Re: Logic question   [#permalink] 23 Jan 2008, 09:28
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Logic question

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