Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 11 - Counting Methods and Probability Theory - 11.7 Events Involving And; Conditional Probability - Concept and Vocabulary Check - Page 746: 7



Work Step by Step

The probability that an event happens at least once can be found by subtracting the probability that the event does not happen from 1. P(event happening at least once) = 1 - P(event does not happen) Thus, if we add all of the probabilities, we get 1.
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