Xiaohong and Xiaoxin are playing games. Use three numbers 4, 5, and 6 to form a three-digit number. If the formed number is a multiple of 5, Xiaohong wins, otherwise Xiaoxin wins. Is this fair? What is the probability that Xiaohong wins?
小红和小新玩游戏．用三个数字4、5、6组成三位数，如果组成的数字是5的倍数就小红赢，否则就小新赢．这样公平吗？小红赢的可能性是多少？
<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

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