概率题求教

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?

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HA, I guess you answered 6/25 and was told wrong. -calligraphy- 给 calligraphy 发送悄悄话 (0 bytes) () 09/26/2012 postreply 11:55:09

exactly, so what is the solution and how, Master.... -tenteddies- 给 tenteddies 发送悄悄话 tenteddies 的博客首页 (0 bytes) () 09/27/2012 postreply 09:48:43

Try 6/25 again. I guess they forgot 5 in the list initially. A v -calligraphy- 给 calligraphy 发送悄悄话 (0 bytes) () 09/27/2012 postreply 11:38:34

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