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When giving a quiz or test, I like to allow the students to choose 6 out of 7 (for example) of the questions I ask, so that they can have one ‘free’ one if they don't know it. Invariably, some students answer all 7. Your website makes it so much easier to deal with this problem (and now the students know I use your site and that I won't just let a wrong answer stand for the one they should have omitted).
—David Webb, University of Mississippi
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