Five red, yellow and blue glass beads of the same size are placed in an opaque box. To ensure that there must be 3 glass beads of the same color among the glass beads that are touched each time, then at least how many glass beads must be touched each time.
在一个不透明的箱子里放了大小相同的红、黄、蓝三种颜色的玻璃珠各5粒．要保证每次摸出的玻璃珠中一定有3粒是同颜色的，则每次至少要摸多少粒玻璃珠．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<result>7</result>