SOLUTION: A bookshelf holds 4 mysteries, 3 biographies, 1 book of poetry, and 2 reference books. If a book is selected at random from the shelf, find the probability that the book selected

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Question 42617: A bookshelf holds 4 mysteries, 3 biographies, 1 book of poetry, and 2 reference books. If a book is selected at random from the shelf, find the probability that the book selected is a biography or reference book.
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Answer by Socom491(19) About Me  (Show Source):
You can put this solution on YOUR website!
Well, there are 10 total books. There are 3 biographies and 2 reference books. So the probability that either will be picked is 5/10 or 1/2.