Answer
$\frac{3}{4}$
Work Step by Step
There are $4$ disks containing a number at least $5$, out of which $3$ are red , thus the probability is $\frac{3}{4}$
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 - 11.7 Events Involving And; Conditional Probability - Exercise Set 11.7 - Page 747: 55
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