Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 2 - Set Theory - Chapter Summary, Review, and Test - Review Exercises - Page 109: 22

Answer

{X | X is a person leaving in United States} ⊂ {Y | Y is a person leaving on planet Earth}

Work Step by Step

{X | X is a person leaving in United States} {Y | Y is a person leaving on planet Earth} If X is a person leaving in the United States means he is also leaving on planet Earth. But it is not confirm that if the person is leaving on planet Earth, then he is also leaving in the United States. First Subset is a proper subset of the Second Set.
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