Answer
$18$
Work Step by Step
Set A includes $2, 4, 5, 7$.
Thus, the number of respondents who agreed with the statement is:
$=2+4+5+7
\\=18$
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 2 - Set Theory - 2.5 Survey Problems - Exercise Set 2.5 - Page 104: 33
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