The Women's World Cup in Canada will be held from June 6 to July 5, 2015. Eight years later, the Chinese women's football team entered the World Cup again. They were in Group A with Canada, New Zealand and the Netherlands. If every 2 teams play one game, how many games will be played in this group match?
加拿大女足世界杯将于2015年6月6日至7月5日进行．时隔八年后，中国女足再次打入世界杯，她们和加拿大、新西兰、荷兰分在A组．如果每2支球队踢一场，这个小组赛一共要踢多少场．
<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>