The school held a table tennis competition, every group of 5 students, every two students in the group had to play one game, and the student with the most points was selected to represent the group. How many games will each team play in total?
学校举行乒乓球比赛，每5个同学一组，小组内每两个同学都要打一场，选拔积分最多的一个同学代表小组参赛．每小组内一共要打几场？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 * (1/2)</gadget>
<output>2</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<result>10</result>