There are 4 pairs participating in a single round robin football match, how many games will be played in total?
有4个对参加足球比赛的单循环赛，共要进行多少场比赛．
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">4 * (3/2)</gadget>
<output>6</output>

<result>6</result>