Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 12 - Counting and Probability - Chapter Test - Page 889: 2



Work Step by Step

Using the diagram: $n(\text{students in at least one course})=4+9+2+7+22+8+15=67$ (These are the numbers inside the circle that represents at least one of the courses.) The total number of students is $70$. Thus, the number of students not taking any course is: $70-67=3$.
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