Mix 10 small sticks of red, blue, and yellow colors together, close your eyes, and take at least how many sticks each time to ensure that there must be 2 small sticks of the same color.
把红、蓝、黄三种颜色的小棒各10根混在一起，闭上眼睛，每次最少拿多少根才能保证一定有2根同色的小棒．
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<result>4</result>