Put 8 balls of each of the four colors of red, yellow, blue, and white into a bag, and at least how many balls must be taken to ensure that three balls of the same color are taken.
把红、黄、蓝、白四种颜色的球各8个放到一个袋子里，至少要取多少个球，才可以保证取到三个颜色相同的球．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<result>9</result>