There are 7 people in a tug-of-war competition. One person is required to be the referee, and the rest are divided into two groups equally. Then, how many different arrangements are there?
有7人进行拔河比赛，要求有1人做裁判，其余人平均分成两组，那么，共有多少种不同的安排方案．
<gadget id="calculator">6 * 5 * 4</gadget>
<output>120</output>

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

<gadget id="calculator">120 / 6</gadget>
<output>20</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">7 * 10</gadget>
<output>70</output>

<result>70</result>