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Unformatted text preview: Arthur Berg 2.4 Counting Rules Useful in Probability 2/ 3 Exercises Exercise 4.114 (p. 185) A student has a drawer with 20 AA batteries. However, three of the twenty batteries were old batteries that she accidently placed back in the drawer. She realizes that the batteries on her calculator are no longer working, and she is in a hurry to get to a test. She grabs two batteries from the drawer at random to replace the two batteries in her calculator. What is the probability that she will get two good batteries so that her calculator will work during the test? Arthur Berg 2.4 Counting Rules Useful in Probability 3/ 3...
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 Fall '08
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 Counting, Probability

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