There are 5 students in class 5 and 2 participating in a table tennis match. Every 2 students will play a game. How many games will there be in total?
五2班有5个同学参加乒乓球赛，每2名同学之间都进行一场比赛，一共要赛多少场．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<result>10</result>