Put 10 beads of each of the four colors of red, yellow, blue, and white into a bag. Take out at least how many balls from it, you can guarantee to get three balls of the same color.
把红、黄、蓝、白四种颜色的珠子各10颗放入到一个袋子里．从中至少取出多少个球，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>