There are 4 people participating in a table tennis match, and every 2 players play one game, how many games do they have in total?
有四人参加乒乓球比赛，每2人比赛一场，他们一共多少场比赛．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">4 * (3/2)</gadget>
<output>6</output>

<result>6</result>