Answer
$\frac{1}{8000}$
Work Step by Step
In this case the events are independent, all having probability $\frac{1}{20}$, thus the probability is: $\frac{1}{20}\frac{1}{20}\frac{1}{20}=\frac{1}{8000}$
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 - Chapter 11 Test - Page 762: 15
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