Fresh potatoes and Dehydrated potatoes

[prashant.ranjan]

Greetings,

Following question is from an official resource ETS GMAT Papar test - 32, Section CR - Q7

[deleted because problem is from a banned source - see below]

I am confused that when we want to find a flaw in an argument, do we need to weaken the conclusion or just find a flaw in the logic. In this question I picked E as the answer. My reasoning was that I need to find another factor responsible for increased price of convenience foods and hence sales is not the only factor. However the answer didn't turn out to be (E). Choice (B) goes on a new level to expose a flaw inherent in the logic of the argument that - cost is not the what it seems.
How do I ensure in flaw questions that an answer of sort of (E) is not the correct answer. If I say that in flaw questions I need to find an inherent falw in the reasoning logic and not weaken the conclusion of the argument (like weaken questions) - then am I correct?

Ron / Stacey if you could help....
Big Fan :D
Prashant

[tim]

paper tests are a banned source; it is illegal to post these questions anywhere on the web. furthermore, paper tests are NEVER a good idea to study from. please restrict yourself to test questions that are less than half your age.. :)