College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 10 - Section 10.1 - Counting - 10.1 Assess Your Understanding - Page 687: 7


$n(A \bigcup B) = n(A) + n(B) - n(A\cap B)$

Work Step by Step

We can count the number of elements of the union of two sets by adding the number of elements each set has and subtracting the number of elements of their intersection. Therefore: $n(A \bigcup B) = n(A) + n(B) - n(A\cap B)$
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