10 people form a circle, and three people are selected from among them, and none of them are adjacent to each other. How many different ways are there to choose?
10人围成一圈，从中选出三个人，其中三人均不相邻，共有多少种不同的选法？
<gadget id="calculator">8 * 7 * 6</gadget>
<output>336</output>

<gadget id="calculator">3 * 2 * 1</gadget>
<output>6</output>

<gadget id="calculator">336 / 6</gadget>
<output>56</output>

<result>56</result>