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OpenStudy (anonymous):
You have four textbooks, each one from a different class. In how many ways can those four books be stacked in your locker?
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OpenStudy (anonymous):
4 choices for the bottom book, times 3 for the one on top of that, times 2 for the one on top of that, times 1 for the one on top 4*3*2*1 = 24
OpenStudy (anonymous):
Yeah, what he said.
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