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 A6: 15


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Work Step by Step

First, the converse is If $2m + 1$ is odd then, $m $ is odd. The counterexample is $m=2$. Then $2m+1=5$ is odd and $2$ is even.
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