There are 3 red balls and 3 white balls in the box, at least how many balls must be drawn by Lin Lin to ensure that there are two balls of the same color.
盒子里有3个红球和3个白球，林林至少要摸出多少个才能保证有两个颜色相同的球．
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<result>3</result>