Any good GMAT tutor wants his or her student to review GMAT homework as efficiently as possible. Careful review of missed GMAT problems is one of the most critical parts of GMAT test prep. So what are our best tips for students as they review missed problems on GMAT practice tests?
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One of the more difficult GMAT problem types deals with summing an arithmetic sequence. Problem 157 in the 12th edition Official Guide is an example:
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