A ball is randomly drawn from a box containing 2 red balls, 3 white balls and 4 blue balls. The balls are all the same except for their color. What is the probability of drawing a white ball?
在装有2个红球，3个白球和4个蓝球的盒子里任意摸出一个球，这些球除颜色外均相同，摸到白球的可能性是多少
<gadget id="calculator">2 + 3 + 4</gadget>
<output>9</output>

<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>