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Finding errors by asking how your answer is wrong

One of the most common situations we face in the MLC is when a student says, "I'm wrong, but I don't know why". They've done a fairly long calculation and put their answer into MapleTA, only to get the dreaded red cross, and they have no idea why it's wrong and how to fix it. One of the major problems is that many students can't tell if it's because they've entered the syntax wrong, or done something wrong in their algebra, or completely misinterpreted the question, or if MapleTA itself has a bug and isn't accepting the correct answer.

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