## Thinking Mathematically (6th Edition)

Published by Pearson

# Chapter 11 - Counting Methods and Probability Theory - 11.7 Events Involving And; Conditional Probability - Exercise Set 11.7: 56

#### Answer

$\frac{1}{3}$

#### Work Step by Step

The probability of event B, assuming that the event A has already occurred, is called the conditional probability of B, given A. This probability is denoted by P(B|A). E: A yellow disk, given that the number selected is at most 3. A: There are 3 disks given that the number selected is at most 3. B: There is only 1 way in which a yellow disk is selected from the 3 disks. P(B|A) = $\frac{1}{3}$

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