In a Go match, a total of 10 students participate in the game. If every two students have to play one game, how many games will there be in total?
在一次围棋比赛中，共有10名同学参加比赛，如果每两名同学之间都要比赛一场，一共要比赛多少场．
<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">10 * (9/2)</gadget>
<output>45</output>

<result>45</result>