by tim Mon Jul 28, 2014 2:07 pm
I can't tell what this question is asking. Whatever symbols you've used haven't rendered correctly. What is - supposed to represent? On my machine it looks like three unrelated and non-mathematical symbols. When you clarify, it will also help if you let us know what you did on this problem so we can help you most effectively.
Tim Sanders
Manhattan GMAT Instructor
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https://www.manhattanprep.com/gmat/forums/a-few-tips-t31405.html