There are 10 children lined up in a row. How many different ways are there to choose 3 children who are not adjacent to each other?
有10个小朋友排成一列，要从中选出3个互不相邻的小朋友，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>