Find all School-related info fast with the new School-Specific MBA Forum

It is currently 25 Jul 2014, 03:57

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

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

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 23 Apr 2007
Posts: 130
Followers: 1

Kudos [?]: 0 [0], given: 0

GMAT Tests User
If A, then B If B, then C. If C, then D. If all of the [#permalink] New post 24 Jun 2007, 07:21
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 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.

Could someone please explain why C is the ans?
coz if not D, then it could be B or C and that means it could be A!
Manager
Manager
avatar
Joined: 23 Dec 2006
Posts: 136
Followers: 1

Kudos [?]: 6 [0], given: 0

 [#permalink] New post 24 Jun 2007, 07:53
This is a case when an understanding of formal logic would come in handy. I don't understand it that well myself, but it's a rule that I've learned:

If we have: If A, then B

The only thing we can infer from this is: If Not B, then Not A

C satifies this condition.
Director
Director
User avatar
Joined: 30 Nov 2006
Posts: 592
Location: Kuwait
Followers: 11

Kudos [?]: 139 [0], given: 0

GMAT Tests User
 [#permalink] New post 24 Jun 2007, 08:17
For events and causations in general, define events x and y.

If X --> Y, this implies three things:

o Y --/-> X
o Z --/-> Y
o No Y, then No X

The third point resides on the reasoning that Y is always a result of event X, and thus if no Y is showing, then X must have NOT happened.

Now, to out question: if not D, then not C; if not C, then not B; if not B, then not A. Therefore, if not D then not A

ANSWER: C
  [#permalink] 24 Jun 2007, 08:17
    Similar topics Author Replies Last post
Similar
Topics:
If A, then B. If B, then C. If C, then D. If all of the avinashbhatm 7 31 May 2006, 06:47
If A, then B. If B, then C. If C, then D. If all of the trulyblessed 7 08 Sep 2005, 19:24
If A, then B. If B, then C. If C, then D. If all of the ywilfred 14 31 Aug 2005, 08:17
If A, then B. If B, then C. If C, then D. If all of the MA 8 19 Apr 2005, 22:34
If A, then B. If B, then C. If C, then D. If all of the Antmavel 6 20 Oct 2004, 07:47
Display posts from previous: Sort by

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

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.