Answer
False,
If x∊W, then x∊D.
Work Step by Step
If x∊D, then x∊W.
The above statement is false.
It is not necessary that an element belong to D must also belong to W.
So the correct statement is
If x∊W, then x∊D.
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 69: 87
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