Put 1 red ball, 2 yellow balls and 3 white balls in an opaque box. What is the probability of drawing a white ball
在一个不透明的盒子里放入1个红球，2个黄球，3个白球．摸得白球的概率为多少
<gadget id="calculator">1 + 2 + 3</gadget>
<output>6</output>

<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>