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In a certain library, 35 percent of the library's books are fiction and 65 percent are non-fiction. Of these books, twenty percent of the fiction
- In a certain library, 35 percent of the library's books are fiction and 65 percent are non-fiction. Of these books, twenty percent of the fiction books are worn out and need replacement, while ten percent of the non-fiction books are worn out and need replacement. What is the probability that a book chosen at random needs to be replaced? (Hint: draw a tree diagram to represent the probabilities.)
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