Answer
b)
Work Step by Step
b) because the statement allows one of them to be a country, it just doesn't let both of them be countries, while b) says none of them are countries.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 3 - Logic - 3.5 Equivalent Statements and Variations of Conditional Statements - Exercise Set 3.5 - Page 170: 18
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