8 classes in the sixth grade of the school hold a single round-robin basketball game, that is, each class has to play one game with other classes, so how many games will be played in total.
学校六年级8个班举行篮球单循环比赛，即每个班都要与其他班比赛一场，那么一共要进行多少场比赛．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">7 * 4</gadget>
<output>28</output>

<result>28</result>