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Re:谁帮我解释一下

Posted by phoenixzz at 2007-09-01 11:23:30 on Problem 3298
In Reply To:谁帮我解释一下 Posted by:ch_619999 at 2007-09-01 10:44:36
1 2 3 4 5 取1或2或3或4或5
5 4 3 2 1 任取两个
5 1 4 2 3 全取
2 4 1 3 5 取213或215或413或415

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