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

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Manager
Joined: 01 Jan 2008
Posts: 217
Schools: Booth, Stern, Haas
If A, then B. If B, then C. If C, then D. If all of the  [#permalink]

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04 Feb 2009, 01:56
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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.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

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Senior Manager
Joined: 26 May 2008
Posts: 409
Schools: Kellogg Class of 2012
Re: CR: if A then B  [#permalink]

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04 Feb 2009, 02:47
C
Director
Joined: 01 Aug 2008
Posts: 627
Re: CR: if A then B  [#permalink]

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04 Feb 2009, 10:38
B
VP
Joined: 18 May 2008
Posts: 1176
Re: CR: if A then B  [#permalink]

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04 Feb 2009, 10:51
C.
This is LSAT question
Intern
Joined: 20 Mar 2007
Posts: 48
Re: CR: if A then B  [#permalink]

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04 Feb 2009, 15:04
Option C
Retired Moderator
Joined: 18 Jul 2008
Posts: 893
Re: CR: if A then B  [#permalink]

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05 Feb 2009, 12:12
C.

Just memorize this.

This is contrapositive logic.
Senior Manager
Joined: 02 Nov 2008
Posts: 251
Re: CR: if A then B  [#permalink]

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05 Feb 2009, 16:36
C.

Just memorize this.

This is contrapositive logic.

exactly. However, this type of logic is never required to answer CR questions in the GMAT.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: CR: if A then B &nbs [#permalink] 05 Feb 2009, 16:36
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# If A, then B. If B, then C. If C, then D. If all of the

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