In how many ways can 12 books be arranged out of 20 different books?
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Given that there are 12 books, these books can be arranged in 12! different ways (12! = 479,001,600) and if each book has 8 different orientations (8 or 68,719,476,736 possible orientations) then there must be: 68,719,476,736 479,001,600 = 32,916,739,307,706,777,600 different arrangements for a stack of 12 books
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throw the rest of books and make some place to store the books
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