There are 15 socks of 5 colors with the same specifications and sizes mixed in the box. If you don’t remember how to take them, you can ensure that there are 3 pairs of socks with matching colors (socks are not divided into left and right) ?
有规格尺寸相同的5种颜色的袜子各15只混装在箱内，试问不记如何取，从箱中至少取出多少只就能保证有3双袜子颜色配套(袜子无左、右之分)？
<gadget id="calculator">6 + 2 + 2</gadget>
<output>10</output>

<result>10</result>