Choose any two numbers from 5, 6, and 7 to form a non-repeating two-digit number. What is the probability that the two-digit number formed is an odd number?
从数字5、6、7中任取2个组成不重复的两位数，组成的两位数是单数的可能性是多少．
<gadget id="calculator">4 / 6</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>