Thinking Mathematically (6th Edition)

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

Chapter 3 - Logic - 3.7 Arguments and Truth Tables - Exercise Set 3.7 - Page 192: 50

Answer

Let\[p\]be I am a full-time student. Let\[q\]be I cannot work. Let \[r\]be I cannot afford a rental apartment costing more than $500 per month. The form of the premises is \[\begin{align} & \underline{\begin{align} & p\to q \\ & q\to r \\ & \\ \end{align}}\ \ \ \ \ \underline{\begin{array}{*{35}{l}} \text{If I am a full-time student, I cannot work}\text{.} \\ \begin{align} & \text{If I cannot work, I cannot afford a rental apartment costing } \\ & \text{more than }\!\!\$\!\!\text{500permonth}\text{.}\\\end{align}\\\end{array}}\\&\\therefore\\\?\\\\\\\\\\text{Therefore,}\\\end{align}\] The conclusion \[p\to r\] is valid because it forms the transitive reasoning of a valid argument when it follows the given premises. The conclusion can be translated as if I am a full-time student, I cannot afford a rental apartment coasting more than 500 per month.
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