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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?
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。