Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 11 - Review Exercises - Page 841: 79

Answer

$\begin{pmatrix} 7 \\ 2 \end{pmatrix}=21$

Work Step by Step

Seventh row of Pascal's triangle: $1~~7~~21~~35~~35~~21~~7~~1$ It corresponds to: $\begin{pmatrix} 7 \\ 0 \end{pmatrix}$ $\begin{pmatrix} 7 \\ 1 \end{pmatrix}$ $\begin{pmatrix} 7 \\ 2 \end{pmatrix}$ $\begin{pmatrix} 7 \\ 3 \end{pmatrix}$ $\begin{pmatrix} 7 \\ 4 \end{pmatrix}$ $\begin{pmatrix} 7 \\ 5 \end{pmatrix}$ $\begin{pmatrix} 7 \\ 6 \end{pmatrix}$ $\begin{pmatrix} 7 \\ 7 \end{pmatrix}$ So, $\begin{pmatrix} 7 \\ 2 \end{pmatrix}=21$
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