Answer
See the solution.
Work Step by Step
Let $A=\emptyset$, and let $B=\{\emptyset \}$. Then $A\in B$ since the empty set is an element of $B$, and $A\subseteq B$ since the empty set is a subset of every set.
Discrete Mathematics and Its Applications, Seventh Edition
by Rosen, Kenneth
Published by
McGraw-Hill Education
ISBN 10:
0073383090
ISBN 13:
978-0-07338-309-5
Chapter 2 - Section 2.1 - Sets - Exercises - Page 126: 18
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