There are 5 students participating in a table tennis competition. If there is a game between two students, how many games will there be in total?
有5位同学参加乒乓球比赛，如果每两个之间赛一场，一共赛多少场？
<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>