There are 8 red balls and 8 white balls of the same size in the box. If you want to draw balls, there must be three of the same color. At least how many balls must be drawn.
盒子里有同样大小的红球和白球各8个，要想摸出的球一定有三个是同色的，至少要摸出多少个球．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<result>5</result>