You gotta laugh, or you're gonna cry

When I put together the Modern Algebra assignment that I am now grading, I assigned problem 13. However, when I went to put together my lecture, I decided I'd take that one off and do it in class. Only I forgot to take it off. So basically, I assigned a problem that I had done, word-for-word, in class. You guessed it: 6 of 19 students got the problem wrong, including 4 who got zero points. I guess I should be grateful that it wasn't worse....

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