books.google.com - The Official Guide for GMAT Review, 12th Edition is the only book on the market written by the creators of the GMAT exam. Inside you’ll find more than 800 actual GMAT questions from previous tests with answers and detailed explanations. There’s also a grammar review, math review, actual essay topics,...https://books.google.com/books/about/The_Official_Guide_for_GMAT_Review.html?id=sQW_fKaYR4QC&q=average+arithmetic+mean&utm_source=gb-gplus-shareThe Official Guide for GMAT Review

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