A box contains 1 red ball, 2 white balls, and 3 black balls, what is the probability of touching the white ball?
一个盒子里装有1个红球，2个白球，3个黑球，摸到白球的可能性是多少．
<gadget id="calculator">1 + 2 + 3</gadget>
<output>6</output>

<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

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