Answer
$2\times3\times7$
Work Step by Step
$2|\underline{42}$ last digit is even
$3|\underline{21}$ sum of digits is divisible by 3
$\ \ \ \ \ 7$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 1 - Section 1.5 - Prime Factorization - Exercise - Page 25: 55
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