# Chapter 4 - Probability and Counting Rules - 4-3 The Multiplication Rules and Conditional Probability - Exercises 4-3 - Page 223: 8

a. 0.807 b. 0.194

#### Work Step by Step

Here P = 0.72 a. P(At least one doesn't use computer) = $1 - (0.72)^{5} = 0.807$ b. P(None use computer) = $(0.72)^{5} = 0.194$

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