Use three number cards with 2, 3, and 4 to form a three-digit number arbitrarily. What is the possibility of forming an odd number?
用写着2、3、4的三张数字卡片任意组成一个三位数，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>