Answer
(a) yes
(b) no
Work Step by Step
(a) 78 is divisible by 3 since its digits add up to a number divisible by 3 (7+8=15, which is divisible by 3)
(b) 78 is not divisible by 4 (78/4=19.5)
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: 5
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