Answer
(a) yes
(b) no
Work Step by Step
(a) 15 is divisible by 3 (since its digits sum to a number divisible by 3: 1+5=6 which is divisible by 3)
(b) 15 is not divisible by 4
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: 1
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