There are currently 6 players participating in a chess game. If there is a game between every two players, how many games will be played in total?
现有6个选手参加象棋比赛，如果要每两个两个之间进行一场比赛，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>