Thinking Mathematically (6th Edition)

by Blitzer, Robert F.

Published by Pearson

ISBN 10: 0321867327

ISBN 13: 978-0-32186-732-2

Chapter 5 - Number Theory and the Real Number System - 5.1 Number Theory: Prime and Composite Numbers - Exercise Set 5.1 - Page 256: 47

Answer

$2$

Work Step by Step

Factor each number completely to obtain: $16=8(2) = 2(2)(2)(2) \\42=7(6) = 7(3)(2)$ Thus, the greatest common divisor is $2$.

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