Answer
$3$
Work Step by Step
We are choosing a subset of r=2 from a set of n=3 people. .... Combinations.
$C(n,r)=\displaystyle \frac{n!}{(n-r)!r!}$
$C(3,2)=\displaystyle \frac{3!}{(3-2)!2!}=\frac{3\times 2}{2\times 1}=3$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 11 - Further Topics in Algebra - 11.6 Basics of Counting Theory - 11.6 Exercises - Page 1060: 4
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