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(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.
_________________

Best,

AkamaiBrah Former Senior Instructor, Manhattan GMAT and VeritasPrep 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

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.

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...

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...

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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