Answer
(a) $ 381024$
(b) $1260$
Work Step by Step
(a) $N=\ _9C_4\cdot\ _9C_3\cdot\ _9C_2=381024$
(b) Use the formula of distinguishable permutations, we have $N=\frac{9!}{4!3!2!}=1260$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 12 - Counting and Probability - Chapter Review - Review Exercises - Page 888: 21
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