There are 5 red, yellow and white balls in a bag, at least how many balls must be taken out to ensure that 3 balls have the same color.
在一个袋子里有红、黄、白三种颜色的球各5个，至少要拿出多少个球才能保证有3个球的颜色相同．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

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

<result>7</result>