There are many identical glass balls in the box, but divided into three colors: red, yellow, and blue. Two balls are drawn each time. In order to ensure that the results are the same for five times, at least how many times do you need to touch the balls.
盒子中装有很多相同的，但分红、黄、蓝三种颜色的玻璃球，每次摸出两个球，为了保证有5次摸出的结果相同，则至少需要摸球多少次．
<gadget id="calculator">3 + 3</gadget>
<output>6</output>

<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">24 + 1</gadget>
<output>25</output>

<result>25</result>