Randomly draw two cards from the three cards 4, 6, and 9 to form a two-digit number. What is the probability of forming an odd number?
从4、6、9三张卡片中任意抽出两张组成一个两位数，组成单数的可能性是多少
<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

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