## Algebra and Trigonometry 10th Edition

$\begin{pmatrix} 8 \\ 4 \\ \end{pmatrix}=70$
$\begin{pmatrix} 8 \\ 4 \\ \end{pmatrix}=\frac{8!}{(8-4)!·4!}=\frac{8\times7\times6\times5\times4!}{4!\times4\times3\times2\times1}=70$
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