There are 12 students in Class 6 (1) playing table tennis. If there is a game between every 2 students, how many games are there in each game?
六(一)班12名同学进行兵乓球比赛，如果每2名同学之间都进行一场比赛，一个比赛多少场．
<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<gadget id="calculator">11 / 2</gadget>
<output>11/2 = around 5.5</output>

<gadget id="calculator">12 * (11/2)</gadget>
<output>66</output>

<result>66</result>