Answer
4
Work Step by Step
In the set of integers from 1 to 12, the following are the ways to generate 2 distinct integers that add up to 9: (1,8), (2,7), (3,6),(4,5).
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 11 - 11.6 - Counting Principles - 11.6 Exercises - Page 823: 13
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