Answer
20
Work Step by Step
$n(A\cup B)=n(A)+n(B)-n(A\cap B)$
$100=60+60-n(A\cap B)$
$100=120-n(A\cap B)$
$20=n(A\cap B)$
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 6 - Section 6.2 - Cardinality - Exercises - Page 415: 17
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