Required Mathematical Intelligence

Chapter 130 Which country are they from?

There are six people of different nationalities, their names are A, B, C, D, E and F; their nationalities are the United States, Germany, Britain, France, Russia and Italy (the order of names and the order of nationality are not necessarily the same )
现已知：（1）A和美国人是医生；（2）E和俄罗斯人是教师；（3）C和德国人是技师；（4）B和F曾经当过兵，而德国人从没当过兵；（5）法国人比A年龄大，意大利人比C年龄大；（6）B同美国人下周要到英国去旅行，C同法国人下周要到瑞士去度假。请判断A、B、C、D、E、F分别是哪国人？

[Answer: Analyze the sentences carefully.According to the first three sentences, we can first conclude that C is not German, American, or Russian. According to 5 and 6, we know that C is not Italian or French, so C is British.Also, according to the first three sentences, we know that A is not American, Russian, or German. According to 5, we know that A is not French or British (C is), so A is Italian.And according to the first three sentences, we know that A, C, and E are not German, and according to 4, we know that B and F are not German, so D is German.Then E is not American, Russian, or German, plus the conclusion that E is not British or Italian, so E is French.Only B and F are left, and the country is only left with Americans and Russians. According to 6, B is not an American, so B is a Russian, and F is an American. ]
(End of this chapter)