Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter R - Review of Basic Concepts - R.1 Sets - R.1 Exercises - Page 7: 30

Answer

$\not \in$

Work Step by Step

The symbol $\in$ means that the number is an element of the set. The symbol $\not \in$ means that the number is NOT an element of the set. Since $13$ is NOT in the given set, then the missing symbol in the blank is $\not \in$
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