There are 8 players participating in a badminton match, and each player has to play one game with each other. How many games will be played in total?
一次羽毛球比赛，有8个人参加，每个人都要与其他人各比赛一场，一共要进行多少场比赛．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">8 * (7/2)</gadget>
<output>28</output>

<result>28</result>