内啥,在报纸上看到的,原题是英文。
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相信我翻译的,看这里:
鲍勃让丹在英语二十六个字母里说任意两个字母,然后他就能拼出包含第一个字母,不包含第二个字母的单词。在丹说了他挑的字母以后,鲍勃说不出符合的单词。丹说了哪两个字母?
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觉得我翻译得狗屁不通的,看这里:
Bob asks Dan to say any two letters in the 26 letters in English and he can spell a word with the first one and without the second one.After Dan says his letters,Bob can't say a word.What letters does Dan say?