Every two students play a chess game, how many games will the 6 students play in total?
每两个同学进行一场象棋比赛，6名同学一共要赛多少场．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">6 * (5/2)</gadget>
<output>15</output>

<result>15</result>