Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 2 - Section 2.2 - Indirect Proof - Exercises - Page 93: 8


Conclusion: You did not send the package on Tuesday.

Work Step by Step

P: You send the package on Tuesday. Q: The package will arrive on Thursday. If P then Q. The contrapositive is also true: If not Q, then not P. The package arrived on Friday. Therefore, you did not send the package on Tuesday.
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