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:
$n(A\cup B)= n(A) + n(B) - n(A\cap B)
\\=15+20-10
\\= 25$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
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 - Page 867: 11
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