Answer
See below
Work Step by Step
$A\cup C=${Dirk,Johan,Frans,Sarie,Hans}
$n(A\cup C)=5$
$n(A)=$4
$n(C)=$2
$A\cap C=${Frans}
$n(A\cap C)=1$
$n(A)+n(C)-n(A\cap C)=4+2-1=5$
$n(A)+n(C)-n(A\cap C)=5=n(A\cup C)$
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: 8
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