Zhenhai District held a youth Go competition. Xiaoming, Xiaojun, Xiaoli and Xiaoqiang were divided into the same group. If each of them had to play a game, how many Go games would the group have to play in total?
镇海区举行青少年围棋比赛，小明、小军、小丽和小强4人被分在同一组，如果他们每两人都要赛一盘，那么这个小组一共要赛多少盘围棋．
<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>