Answer
Sometimes
Work Step by Step
Some group members may have a sibling while others may be an only child, so you have to go with the choice of sometimes.
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 1 - Foundations for Algebra - Concept Byte - Page 37: 7
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