Answer
The 21st term is B.
Work Step by Step
The 3rd and 6th positions contain B. Each position that is a multiple of 3 contains B. 21 is a multiple of 3, so the 21st position will contain B.
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 2 - Reasoning and Proof - 2-1 Patterns and Inductive Reasoning - Got It? - Page 83: 2
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