In the World Cup group stage, each group has 4 teams, and every 2 teams have to play a game. How many games will this group play in total?
世界杯小组赛，每个小组有4支球队，每2支球队都要进行一场比赛，这个小组一共要进行多少场比赛．
<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>