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: $P(\text{A or B})=P(A)+P(B)-P(\text{A and B})=\frac{9}{20}+\frac{12}{20}-\frac{4}{20}=\frac{17}{20}$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
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
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