Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 12 - Data Analysis and Probability - 12-6 Permutations and Combinations - Lesson Check - Page 753: 10


There is only one way to pick all of the items of a set.

Work Step by Step

If we let $n=2$ (a,b), we can pick either a,b or b,a; however, the same letters are chosen. Combinations don't care about order, so that's why we can take a,b and b,a to be the same combination.
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