\[C_{12}^{3} = \frac{12!}{3!(12 - 3)!} =\]
\[= \frac{12 \bullet 11 \bullet 10 \bullet 9!}{3 \bullet 2 \bullet 9!} = 2 \bullet 11 \bullet 10 =\]
\[= 220\ способов.\]
\[Ответ:\ \ 220.\]