There are 4 teams participating in the Olympic basketball semi-finals, and every two teams will play one game. How many games will there be in total?
奥运会篮球半决赛，有4支球队参赛，每两个队要赛一场，一共要赛多少赛．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<result>6</result>