A bag is filled with 3 red, yellow and 3 balls of two colors. These balls are all the same size. If 3 balls are drawn at a time, how many of them have the same color.
一个袋子里装着红、黄、二种颜色球各3个，这些球的大小都相同，问一次摸出3只球，其中至少有多少只球的颜色相同．
<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<result>2</result>