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Mrs Brown goes up to a window to buy a cinema ticket .One pe

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Mrs Brown goes up to a window to buy a cinema ticket .One person buys a ticket and walks away.There are now three people in front lf Mrs Brown and four behind.
How many people go to the window to buy tikets at least?
Mrs Brown goes up to a window to buy a cinema ticket .One pe
9 persons
再问: Really?
再答: 走了1个,前面有3个,后面有4个,加她不就至少有9个人买票么
再问: 我也这么认为 ,但总觉得怪怪的。