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thanks for your analysis. The answer is 2

farmer(农夫)
(#238306@0)
Last Updated: 2001-10-26
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微软试题:一共50个主人,每人一条狗，其中确认有病狗。病狗一眼就可以分辨出来,而每个主人一天只能看一次，只能看到别人的狗，要求在确认出自己的狗是病狗时必须开枪杀了它。结果第三天听到一阵枪声，请问多少条狗是病狗？
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