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March 29, 2015

Homework Help: math

Posted by M.A. on Tuesday, February 9, 2010 at 9:45am.

Four students fall asleep during class and, while asleep, the professor rearranges their notebooks so that when they wake up, nobody has his or her own notebook. In how many ways could the professor have rearranged the notebooks?
4
6
9
24
Explain

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