概率题求教

来源: 于 2012-09-25 18:43:54 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

A three-digit number is drawn at random from all possible 3-digit numbers formed by the digits 1, 2, 3, 4, and 6.  What is the probability that the number drawn is an even number less than 500 containing NO digits more than once?