There are 4 teams in each group in the World Cup, and every 2 teams have to play a game. How many games are played in each group?
世界杯足球赛每组4个队，每2队都要进行一场比赛，每组共进行多少场．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<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>