Many years ago as a graduate assistant, I taught a college algebra class that was a requirement for students majoring in non-technical subjects. The tests were pretty straightforward and consisted of numerical problems and some word problems that included numbers. On the first test, it was pretty obvious to me that there was a lot of cheating going on, so I constructed two nearly identical versions of the second test that differed only in some of the numbers within the problems. At a casual glance, all the tests appeared to be the same; however, the answers to those problems differed.
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