Discrete Mathematics and Its Applications, Seventh Edition

Published by McGraw-Hill Education
ISBN 10: 0073383090
ISBN 13: 978-0-07338-309-5

Chapter 4 - Section 4.1 - Divisibility and Modular Arithmetic - Exercises - Page 245: 28


a) no b) yes c) no d) yes

Work Step by Step

a) 37=3+34, and 34 is not a multiple of 7 b) 66=3+63=3+7(9) c) -17=3-20, and 2- is not a multiple of 7 d) -67=3-70=3+7(-10)
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