Statistics: Informed Decisions Using Data (4th Edition)

Published by Pearson
ISBN 10: 0321757270
ISBN 13: 978-0-32175-727-2

Chapter 5 - Section 5.5 - Assess Your Understanding - Applying the Concepts - Page 307: 67c

Answer

$1056$ ways.

Work Step by Step

- First, from the 12 remaining ranks, we must select two of them. They must be different. It is a combination of 12 distinct ranks taken 2 at a time: $_{12}C_2=\frac{12!}{2!(12-2)!}=\frac{12!}{2!\times10!}=\frac{12\times11\times10\times9\times8\times7\times6\times5\times4\times3\times2\times1}{2\times1\times10\times9\times8\times7\times6\times5\times4\times3\times2\times1}=66$ - Now, for each of the two ranks we have 4 choices: First rank: 4 choices Second rank: 4 choices Using the Multiplication Rule of Counting (see page 298): $66\times4\times4=1056$
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