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 244: 21

Answer

a) 1 b) 2 c) 3 d) 9

Work Step by Step

a) 13 mod 3 13=3*4+1=1 b) -97 mod 11 -97=-9(11)+2=2 c) 155 mod 19 155=19*8+3=3 d) -221 mod 23 -221=-10(23)+9=9
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