Answer
The next number is 21.
Work Step by Step
The difference between the two consecutive numbers in the series is increasing by 1 every time. Therefore the next number is 21.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 1 - Problem Solving and Critical Thinking - Chapter Summary, Review, and Test - Review Exercises - Page 43: 5
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