Mathematics, 27.07.2019 23:00 rebtav

You have 40 different books: 20 math books, 15 history books, and 5 geography books. in how many different ways can you put the 40 books in a row on a shelf?

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You have 40 different books: 20 math books, 15 history books, and 5 geography books. in how many di...