Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 12 - Counting and Probability - Section 12.1 Counting - 12.1 Assess Your Understanding: 11

Answer

$25$

Work Step by Step

Given: $n(A) = 15 , n(B) = 20$ and $n(A∩B)= 10$ Use the formula $n(A\cup B)= n(A) + n(B) - n(A\cap B)$ to obtain: $n(A\cup B)= n(A) + n(B) - n(A\cap B) \\=15+20-10 \\= 25$
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