There are four teams in Group A of the 2010 World Cup, and every two teams will play a game. This group will play a total of 6 games.
2010年世界杯足球赛A组一共有四支球队，每两支球队要踢一场球，这个小组一共要踢6场球．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

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

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

<result>6</result>