Put 10 balls of five colors, red, yellow, white, green, and blue in a bag, and take at least how many balls to ensure that you get two balls of the same color.
把红、黄、白、绿、蓝五种颜色的球10个放在一个袋子里，至少取多少个球，可以保证取到两个颜色相同的球．
<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>