<p>I think a significant number of math majors take 18.100A. Unfortunately, it doesn’t seem to be good preparation for further math classes that have 18.100 as a prerequisite, since so many people take 18.100B or 18.100C.</p>
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<p>I don’t think this is a good metric to use. At least in math, most of the textbooks used in undergraduate classes are also used at a wide variety of schools. And the problems in problem sets in many cases come exclusively from textbooks.</p>