Using 1, 3, 5 to form six different three-digit numbers, what is the probability that it is greater than 500
用1、3、5组成六个不同的三位数，大于500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>