Question: Enter numeric values without units and symbols. If the answer is 1,200 ways, enter 1200 as your answer. Over the last week, Homer Simpson has


Enter numeric values without units and symbols. If the answer is 1,200 ways, enter 1200 as your answer. Over the last week, Homer Simpson has purchased 10 books. In how many ways can he pick four of these books and arrange them in order on his bookshelf? In how many ways can he choose four of these books to take with him on his vacation
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