Choose 5 people from 12 races to hold a meeting, and 3 people A, B, and C must go to the meeting, so how many different ways are there to choose?
从12个人种选5个人去开会，其中的A、B、C3个人必须去开会，那么有多少种不同的选法．
<gadget id="calculator">12 - 3</gadget>
<output>9</output>

<gadget id="calculator">9 * 8</gadget>
<output>72</output>

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

<gadget id="calculator">72 / 2</gadget>
<output>36</output>

<result>36</result>