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题库 / GMATAdvanced-PS-5
Pat will walk from intersection X to intersection Y along a route that is confined to the square grid of four streets and three avenues shown in the map above. How many routes from X to Y can Pat take that have the minimum possible length?
Six
Eight
Ten
Fourteen
Sixteen
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右2步，上3步。堪称5个要素的排列组合，就是5!/(2!*3!)
同类题型同理
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