Answer
false
Work Step by Step
$n(A\cup B)=n(A)+n(B)$
This is false; the correct formula is:
$n(A\cup B)=n(A)+n(B)-n(A\cap B)$
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 2 - Set Theory - 2.3 Venn Diagrams and Set Operations - Exercise Set 2.3 - Page 83: 156
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