There are three students playing a game of chess, how many games of chess will be played in total for each 2 students.
有三个同学进行象棋比赛，每2人下一盘象棋，一共要下多少盘象棋．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

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

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

<result>3</result>