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In Kaplan textbook, GMAT Premier 2012, it states on the side of the page 279 in Expert Exclusive:
"When the phrase "which of the following" appears in a Problem Solving question, the answer slightly more likely to be (D) or (E) than (A), (B) or (C). Note : This is only true for Problem Solving, not for Verbal."
Is this "exclusive" worth keeping in mind? I would have thought that Answer Choice in problem solving questions would appear randomly?
What should we take away from this (i.e. if you've not the faintest idea, pick D or E and take your chances)?
Many thanks.
Options in problem solving questions are arranged in increasing/decreasing order.
If I were to guess the reason they say that the answer is more likely to be (D) or (E), I would say that they are thinking of the 'back solving' or 'using options' scenario i.e. you pick an option at a time and see if it satisfies the condition.
You may be tempted to use options in certain question formats e.g. "Which of the following could be the value of x?"
Here, the question setter may give you incorrect numbers in first 2-3 options to discourage you/make you nervous/waste your time/encourage you to use a logical method instead. That is probably the reason they say that options (D) and (E) are more likely. But mind you, GMAT question setters are extremely smart. It is very unlikely that something like this will work.
All I can say is that if you plan to use options, you should pick the middle number (generally option (C)) and start with that. It will generally tell you which way to go, lower or higher. So you should have your answer by checking at most 2 options.