A box is filled with 100 black and white balls, if two balls are randomly picked out and at least one of them is white, then how many white balls should there be more than black balls?
一个盒子里装了黑白两种颜色的小球共100个，任意拿出两个球至少有一个是白色的，则白球应比黑球的多多少个．
<gadget id="calculator">100 - 1</gadget>
<output>99</output>

<gadget id="calculator">99 - 1</gadget>
<output>98</output>

<result>98</result>