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求助一道数学题,谢谢各位!

1。alan and betty live in a multi-story apartment buiding.how many stories does the building have?

(1)there are 3 stories between those on which alan and betty live

(2)there are 9 stories above alan's floor and 9 stories below betty's floor

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选E,因为不知道A和B 谁在上,谁在下

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 E

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