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A science teacher is arranging her books on a shelf. She has 4 Astronomy books, 3 Biology books, and 2 Chemistry books. How many ways can she arrange these books on the shelf if the books from each subject must be together?

 

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 May 22, 2021
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The number of arrangements is 9!/(2!*3!*4!) = 1260.

 May 22, 2021

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