# Geometry

A bookshelf contains 9 mysteries, 7 biographies, and 4 science fiction books. A book is randomly selected, not replaced, then another is selected. Find the probability of selecting a biography then a mystery.

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1. Oh i forgot to put what I think. Is it 7/20 because it's 20 total books and only 7 of them are biographies?

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2. so far, so good. The probability of getting both books is

7/20 * 9/19

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oobleck
3. You have 20 books.
The chance of getting a biography is 7/20
Not replaced so now you have 19 books
mystery would be 9/19

You have to multiply 7/20 times 9/19 to get the probability of selecting a bio then a mystery book. I don't know if your teacher wants the answer in fraction or decimal form.

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4. 63/320?

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5. 20*19 = 380, not 320

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Reiny
6. A bookshelf contains 9 mysteries, 7 biographies, and 4 science fiction books. A book is randomly selected, not replaced, then another is selected. Find the probability of selecting a biography then a mystery.

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7. A bookshelf contains 9 mysteries, 7 biographies, and 4 science fiction books. A book is randomly selected, not replaced, then another is selected. Find the probability of selecting a biography then a mystery.
Give answer as a fraction in simplest form.

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