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: 12



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: $45 = 30 + 40 - n(A\cap B)$ $n(A\cap B)=25$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.