8 students participate in a table tennis competition, and every two students have to play one game. How many games are there in total?
8名同学参加乒乓球比赛，每两名同学都要比赛一场，一共比赛多少场．
<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>