In a pocket there are 1 black ball, 3 white balls, and 4 red balls. Question: At least how many balls must be drawn from it to ensure that there are white balls among them.
在一个口袋中有1个黑球、3个白球、4个红球．问：至少从中取出多少个球，才能保证其中有白球．
<gadget id="calculator">1 + 4 + 1</gadget>
<output>6</output>

<result>6</result>