In a Go match, a total of 4 students participate in the game, if every two players have to play one game, how many games will be played in total.
在一次围棋比赛中，共有4名同学参加比赛，如果每两个选手都要比赛一场，一共要比赛多少场．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">4 * (3/2)</gadget>
<output>6</output>

<result>6</result>