Author: David@VeritasPrep
Posted: Sun Jun 23, 2013 6:30 pm (GMT -7)
This is a simple formal logic problem and would not appear in this form on the GMAT.
The posting above is correct. The answer is B. It reverses the sufficient and the necessary condition in the same way that the stimulus does.
Choice A is not reversing the sufficient and the necessary it is negating them. So that is different. A says " if smoking therefore lower life expectancy" The is says "if not smoking then not lower life expectancy." This is simply negating each part of the argument and that is not logically valid. You have stated the reasons why this is not valid --- your meth addicted fisherman is an extreme case....
_________________
David Newland, JD, MA, MAE
GMAT Instructor, Tutor, and Author
Veritas Prep
My next online course starts Tuesday July 9th and is Tuesday - Thursday from 6AM to 9AM Eastern (New York) Time.
And then I have a Monday- Wednesday from 7PM to 10PM Eastern (New York) Time starting on August 5th.
Posted: Sun Jun 23, 2013 6:30 pm (GMT -7)
This is a simple formal logic problem and would not appear in this form on the GMAT.
The posting above is correct. The answer is B. It reverses the sufficient and the necessary condition in the same way that the stimulus does.
Choice A is not reversing the sufficient and the necessary it is negating them. So that is different. A says " if smoking therefore lower life expectancy" The is says "if not smoking then not lower life expectancy." This is simply negating each part of the argument and that is not logically valid. You have stated the reasons why this is not valid --- your meth addicted fisherman is an extreme case....
_________________
David Newland, JD, MA, MAE
GMAT Instructor, Tutor, and Author
Veritas Prep
My next online course starts Tuesday July 9th and is Tuesday - Thursday from 6AM to 9AM Eastern (New York) Time.
And then I have a Monday- Wednesday from 7PM to 10PM Eastern (New York) Time starting on August 5th.