Thinking Mathematically (6th Edition)

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

Chapter 3 - Logic - 3.1 Statements, Negations, and Quantified Statements - Exercise Set 3.1 - Page 120: 27

Answer

Sigmund Freud's father was 20 years older than his mother.

Work Step by Step

~r represents negation of statement r. So, if r is false then ~r will be a true statement. Statement ~r is " Sigmund Freud's father was 20 years older than his mother."
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