There are 5 players in the final Go finals, and every two players will play one game, how many games will be played in total.
有5名选手进行最后的围棋决赛，其中每两名选手之间赛一场，一共要进行多少场比赛．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">4 * (5/2)</gadget>
<output>10</output>

<result>10</result>