In a badminton match, there are 10 players participating in the match. If there is a game between every two people, how many games will there be in total?
在一场羽毛球比赛中，有10人参加比赛．如果每两个人之间都要比赛一场，一共要比赛多少场？
<gadget id="calculator">90 / 2</gadget>
<output>45</output>

<result>45</result>