Answer
7
Work Step by Step
The number of possible combinations if r items are taken from n items is
nCr = $\frac{n!}{r!(n-r)!}$
7C1 = $\frac{7!}{1!(7-1)!}$
=$\frac{7!}{1!6!}$
=$\frac{7*6!}{1!6!}$
Therefore, the result is 7.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 11 - Counting Methods and Probability Theory - 11.3 Combinations - Exercise Set 11.3 - Page 707: 12
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