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: 13

Answer

40

Work Step by Step

By using the counting formula for finite sets: $n(A\cup B)= n(A) + n(B) - n(A\cap B)$ By substituting: $50 = n(A) + 20 - 10$ $n(A)=40$
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