Answer
The time is not 4 o’clock.
Work Step by Step
We set $A$ to refer to the time, which is 4 o'clock; thus, $A$ is true. The negation of $A$ must be false, so we can say:
The time is not 4 o’clock
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Appendix A - The Language of Mathematics - Exercises - Page A5: 3
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