There are red, orange, and yellow balls in a bag, and each person randomly touches 2 balls, so there must be at least a few people to ensure that two or more people choose the same ball.
一个袋子里红、橙、黄三种颜色的球，每人任意摸2个，那么至少有几个人才能保证有两个或两个以上的人所选的小球相同．
<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<result>7</result>