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Mathematics 4 Online
OpenStudy (anonymous):

How many different ways can three books be lined up on a shelf? A. 3 B. 6 C. 9 D. 12

OpenStudy (anonymous):

B. 6. I drew up the books, ABC First | A A B B C C Second | B C A C A B Last | C B C A B A Each book gets a turn on either side.

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