There are 8 students in a class playing table tennis - every two students have to play a game, how many games are there in total.
某班8名同学进行乒乓球比赛-每两名同学之间都要进行一场比赛，一共要比赛多少场．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">8 * (7/2)</gadget>
<output>28</output>

<result>28</result>