The numbers "1", "2" and "3" are written on the three cards respectively. If one is drawn randomly, the probability of drawing card "1" is ((())/(())).
三张卡片上分别写有数字"1"、"2"，"3"，任意抽出一张，抽出卡片"1"的可能性是((())/(()))．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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