GMAT Official Guide 12: Problem Solving 72

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This is a video explanation to a question in the 12th Edition of the GMAT Official Guide, available here: http://www.amazon.com/gp/product/0470449748/ref=as_li_tf_tl?ie=UTF8&tag=magoosh07-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=0470449748

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Видео GMAT Official Guide 12: Problem Solving 72 канала Magoosh GMAT & MBA Admissions