There are 11 balls of the same size and material in a box, including 3 red balls, 4 black balls, and 4 white balls. What is the probability of touching the white balls?
一个盒子里有大小材质完全相同的11个球，其中红球3个，黑球4个，白球4个，摸到白球的可能性是多少．
<gadget id="calculator">4 / 11</gadget>
<output>4/11 = around 0.363636</output>

<result>4/11 = around 0.363636</result>