Answer
See below.
Work Step by Step
If the odds in favour of an event $E$ are $x$ to $y$, then the probability of $E$ is: $P(E)=\frac{x}{x+y}$
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 11 - Counting Methods and Probability Theory - 11.6 Events Involving Not and Or; Odds - Exercise Set 11.6 - Page 737: 99
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