Answer
Ø ⊆ { }
Work Step by Step
As both the set one and set two are empty sets.
As each set is the subset of itself, so empty set is the subset of empty set.
Ø ⊆ { }
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 2 - Set Theory - 2.2 Subsets - Exercise Set 2.2 - Page 68: 18
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