There are 1 red ball, 2 yellow balls, and 3 green balls with the same shape in the cloth bag. You are asked to touch any one of the balls. The probability (possibility) of touching the yellow ball is expressed in fractions.
布袋里有外形完全一样的1只红球、2只黄球、3只绿球，让你从中任意摸一只球，摸到黄球的概率(可能性)用分数表示是多少．
<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>