Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 11 - 11.6 - Counting Principles - 11.6 Exercises - Page 825: 73


36 lines.

Work Step by Step

Each line will be obtained by selecting two different points among the 9 points. The order in which the two points are selected is not important. So, it is a combination: $_9C_2=\frac{9!}{(9-2)!~2!}=\frac{9\times8\times7!}{7!~2}=36$
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