In a table tennis match, 8 participating players compete in a round-robin match (every two players play one game), how many games are there in total?
在一次乒乓球比赛中，参赛的8名队员进行循环赛(每两个人赛一场)，共比赛多少场．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">8 * (7/2)</gadget>
<output>28</output>

<result>28</result>