#### Answer

$7$

#### Work Step by Step

A and C, or in mathematical notation $A\cap C$, means the set of all elements that are in both sets A and C.
Using the diagram, we have:
$n(A\cap C)=1+6=7$

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Published by
Pearson

ISBN 10:
0-32193-104-1

ISBN 13:
978-0-32193-104-7

$7$

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