Put 4 white balls, 2 red balls and 3 green balls of the same size in an opaque box, the probability of touching any green ball is ((())/(())).
将大小相同的4个白球、2个红球和3个绿球放在不透明的箱子里，任意摸到绿球的可能性是((())/(()))．
<gadget id="calculator">4 + 2 + 3</gadget>
<output>9</output>

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

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