Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10: 9781285195698
ISBN 13: 978-1-28519-569-8

Chapter 2 - Section 2.2 - Indirect Proof - Exercises - Page 80: 8

Answer

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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