There are 6 balls of red and white in the bag. It is required to draw a ball at random, so that the possibility of touching a red ball is greater than the probability of touching a white ball. How many white balls can be placed in the bag at most.
袋子里有红、白两种颜色的6个球，要求任意摸出一个球，使摸到红球的可能性比摸到白球的可能性大，袋子中最多放多少个白球．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<result>2</result>