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英语翻译Each · in the mileage table above represents an entry in

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英语翻译
Each · in the mileage table above represents an entry indicating the distance between a pair of the five cities.If the table were extended to represent the distances between all pairs of 30 cities and each distance were to be represented by only one entry,how many entries would the table then have?
偶是阿虚,芥末绿茶z你好:
这道题说在这个里程表里,有五个城市.每一个点表示一个城市到另一个城市的距离.如果有三十个城市,请问有多少个点?(A到B,B到A算一个,因为是距离嘛)
best wishes,kyon