The school organizes a table tennis competition, and there are 7 other players in the same group as Xiaopang. The group conducts a single round-robin competition. How many games does Xiaopang's group have to play in total?
学校组织乒乓比赛，和小胖同组的选手还有7名，小组进行单循环比赛，小胖所在的小组共要进行多少场比赛．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">7 * 4</gadget>
<output>28</output>

<result>28</result>