## Precalculus (6th Edition)

Published by Pearson

# Chapter R - Review of Basic Concepts - Chapter R Test Prep - Review Exercises - Page 82: 21

#### Answer

$\emptyset'=U$

#### Work Step by Step

RECALL: $A'$ represents the complement of $A$, which is the set that contains the elements of the universal set $U$ that are not in $A$> The empty set has no elements. Thus, its complement will be all the elements of the universal set. Therefore, $\emptyset'=U$

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