Calculus (3rd Edition)

Published by W. H. Freeman
ISBN 10: 1464125260
ISBN 13: 978-1-46412-526-3

Appendix A - The Language of Mathematics - Exercises - Page A5: 2



Work Step by Step

Choose $A$ to refer to the action "The car has gas", and $B$ to refer to the action "it will run". Now, we have the implication $A\Longrightarrow B$. So its contrapositive is $\neg B\Longrightarrow \neg A$. Therefore, the right answer is: (b) If the car will not run, then it has no gas.
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