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You have 6 different Algebra books, 5 different Biology books, 4 different Chemistry books, and 3 different copies of the novel Dune. In how many distinct ways can you arrange

 

a) 10 books on a shelf if exactly 4 must be Algebra books?

b) all of the books on a shelf if the copies of Dune must be on the ends?

 
 Feb 27, 2021

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