§ Задание 446
\[C_{9}^{3} = \frac{9!}{3!(9 - 3)!} = \frac{9 \bullet 8 \bullet 7 \bullet 6!}{3 \bullet 2 \bullet 6!} =\]
\[= 3 \bullet 4 \bullet 7 = 84\ способов.\]
\[Ответ:\ \ 84.\]
\[C_{9}^{3} = \frac{9!}{3!(9 - 3)!} = \frac{9 \bullet 8 \bullet 7 \bullet 6!}{3 \bullet 2 \bullet 6!} =\]
\[= 3 \bullet 4 \bullet 7 = 84\ способов.\]
\[Ответ:\ \ 84.\]