There are 7 students in class 6 and 1 playing table tennis. If there is a game between every two students, how many games will there be in total?
六1班7名同学进行乒乓球比赛，如果每两名同学之间都进行一场比赛，一共要比赛多少场．
<gadget id="calculator">7 - 1</gadget>
<output>6</output>

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

<gadget id="calculator">6 * (7/2)</gadget>
<output>21</output>

<result>21</result>