FORMAL LOGIC QUIZ : GMAT Verbal Section
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# FORMAL LOGIC QUIZ

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14 Aug 2003, 05:57
Premises:

(1) If B, then C
(2) If A, then B
(3) not D, unless E
(4) C, only if D

Find a correct conclusion:

(A) If D, then not B
(B) If E, then not A
(C) D, only if B
(D) If not E, then not A
(E) not E, unless A
If you have any questions
New!
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15 Aug 2003, 00:42
stolyar wrote:
Premises:

(1) If B, then C
(2) If A, then B
(3) not D, unless E
(4) C, only if D

Find a correct conclusion:

(A) If D, then not B
(B) If E, then not A
(C) D, only if B
(D) If not E, then not A
(E) not E, unless A

It's too bad no one seems to want to try to learn how to solve these. You will get at least 1-2 formal logic questions and ETS considers many of them to be difficult. Once you understand them, however, they are VERY simple because there is absolutely no ambiguity as to the answer -- easier than simple algebra.
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AkamaiBrah
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Vice President, Midtown NYC Investment Bank, Structured Finance IT
MFE, Haas School of Business, UC Berkeley, Class of 2005
MBA, Anderson School of Management, UCLA, Class of 1993

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15 Aug 2003, 01:05
(E) ?
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15 Aug 2003, 01:26
E is wrong
Do not guess—solve!
All the materials you need lie on the site.

It took me less than 7 minutes to INVENT the problem. How comes? Read Identifying the Hidden.
Director
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15 Aug 2003, 04:06

Thanks to AkamaiBrah for posting his nice notes on If/Then logic.
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15 Aug 2003, 05:03

Thanks to AkamaiBrah for posting his nice notes on If/Then logic.

Well done!!!
Thank you for giving it a nice try, and thank Akamai for posting his material. I anticipate that now people will ask you to post a solution. I for one will post more new FL quizes.
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18 Aug 2003, 23:55
stolyar wrote:

Thanks to AkamaiBrah for posting his nice notes on If/Then logic.

Well done!!!
Thank you for giving it a nice try, and thank Akamai for posting his material. I anticipate that now people will ask you to post a solution. I for one will post more new FL quizes.

okey, guys, can i have the link to this posting of akamai? would be much appreciated...
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24 Dec 2006, 18:25
Can anyone please explain this soultion
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24 Dec 2006, 20:17
mitul wrote:
Can anyone please explain this soultion

let me try

A -> B
B -> C
C -> D
D <- E

therefore, if it isn't E, A isn't meant to be
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24 Dec 2006, 21:30
I go with D. Here's a picture to illustrate the reasoning.
Attachments

LOGIC.JPG [ 8.11 KiB | Viewed 1100 times ]

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25 Dec 2006, 04:15
Stoylar, where are you buddy? The last I heard, you graduated from GSB and became a senior partner at some high rolling boutique consulting firm. Be careful not to overindulge at those posh company annual retreats...
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25 Dec 2006, 09:16
Should C and D in the same circle?
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25 Dec 2006, 09:34
HongHu wrote:
Should C and D in the same circle?

Good point. I think C only if D implies that C is a subset of D.

So D should encompass the circle C.

C = D are the same when 'C if and only if D'.

The correct diagram should look like...
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25 Dec 2006, 10:40
It took me about 2 minutes to come up with D as the solution

Here is why:

A --> B --> C [ if C then definitely A and B; if A is True, then B and C are also True, always ]
E --> D [ D only true if E, otherwise D is NOT true ]
D --> C [ C is true only if D is true ]

Choice D says if not E, then not A
If Not E --> then D can not be true (statement 2)
If NOT D --> then C can not be ture (statement 3)
If C is not true --> neither A nor B are ture (statement 1)
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01 Jan 2007, 13:43
Yes. The answer is clearly D. The question stem presents a number of logical statements that can be stated as

A => B => C => D => E

Only answer D states something that is consistent with the stem: NOT E => NOT A, which is equivalent to A => E.
01 Jan 2007, 13:43
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