Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 10 Counting Methods and Probability - 10.4 Find Probabilities of Disjoint and Overlapping Events - 10.4 Exercises - Problem Solving - Page 713: 49

Answer

$\frac{17}{20}$

Work Step by Step

We know that $P(\text{A or B})=P(A)+P(B)-P(\text{A and B})$. Hence here: $P(\text{A or B})=P(A)+P(B)-P(\text{A and B})=\frac{9}{20}+\frac{12}{20}-\frac{4}{20}=\frac{17}{20}$
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