There are 5 students in class 6 and 1 playing table tennis. If every 2 students play a game, how many games will there be in total?
六1班5名同学进行乒乓球比赛，如果每2名同学之间都进行一场比赛，一共要比赛多少场．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>