There are 3 red and 3 blue balls in the box. Now we need 2 balls of the same color. If we don’t know the color of the balls, how many balls should we take out from the box? fulfil requirements?
箱子里有红、蓝两种颜色的小球各3个，现在需要同一种颜色的小球2个，问在不清楚小球颜色的情况下，从箱子里面至少要拿出多少个小球才能满足要求？
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<result>3</result>