The school held a table tennis competition. In the end, 6 students entered the final. If every two students had to play one game, how many games would there be in the final?
学校举行乒乓球比赛，最后有6名同学进入决赛，如果每两名同学要比赛一场，决赛一共要进行多少比赛．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">6 * (5/2)</gadget>
<output>15</output>

<result>15</result>