#### Answer

The next number in the sequence is 21.

#### Work Step by Step

Starting with the first value, the difference between each number in the sequence increases by 1, i.e. 6+7=7, 7+2=9, 9+3=12, 12+4=16, 16+5=21.

Published by
Pearson

ISBN 10:
0321825535

ISBN 13:
978-0-32182-553-7

The next number in the sequence is 21.

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