Among the students in the painting interest group of Hope Primary School, the oldest is 12 years old and the youngest is 6 years old. If you select as many students as you need at least, you will be able to find two students of the same age.
希望小学绘画兴趣小组同学中，最大的12岁，最小的6岁，最少从中挑选多少名学生，就一定能找到两个学生年龄相等．
<gadget id="calculator">12 - 6</gadget>
<output>6</output>

<gadget id="calculator">6 + 1 + 1</gadget>
<output>8</output>

<result>8</result>