by tim Sat Mar 26, 2016 9:52 pm
Two questions:
(1) Have you ever seen it used in the correct answer of a legitimate question? If not, you have no reason to know for sure that it is a thing.
(2) Have you ever seen it used in the incorrect answer of a legitimate question where that was given as a reason the answer was incorrect? If not, you have no reason to know for sure that it is not a thing.
If the answer to both (1) and (2) is NO, then there is no point in worrying about it.
Tim Sanders
Manhattan GMAT Instructor
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https://www.manhattanprep.com/gmat/forums/a-few-tips-t31405.html