There are 8 chopsticks in three colors of yellow, blue and red in the cloth bag. They are identical except for the different colors. Now, at least how many chopsticks can be found out of the bag to ensure that there are 2 pairs of chopsticks of different colors.
布袋里有黄、蓝、红三种颜色的筷子各8根，它们除了颜色不同外完全相同，现在从中至少摸出多少根筷子，才能保证有2双不同颜色的筷子．
<gadget id="calculator">3 + 7 + 1</gadget>
<output>11</output>

<result>11</result>