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At a used-book sale, 100 books are adult books and 160 are children’s books. Seventy of...

At a used-book sale, 100 books are adult books and 160 are children’s books. Seventy of the adult books are nonfiction while 100 of the children’s books are fiction. Assume a book is selected at random, what is the probability that the book is an adult book or a children’s nonfiction book?

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