There are 4 teams, and every two teams have to play one game. How many games will there be in total?
有4个球队，每两队都要比赛一场，一共要比多少场．
<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>