英语翻译31.In the table above,what is the least number of table

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英语翻译
31.In the table above,what is the least number of table entries that are needed to show the mileage between each city and each of the other five cities?
(A)15 (B)21 (C)25 (D)30 (E)36
请问这道题的中文翻译,完全不明了这题想干什么.

本题意为在多少个位置上填入数字才能展示每个城市与其他5个城市之间的距离.由最笨但最易理解的方法：A栏中填入5个位置表示其与B,C,D,E,F的距离,而B栏中填入4个位置表示其与C,D,E,F的距离,而C栏中需填入3个位置,同理D栏中填入2个位置,E栏中只需填入一个位置得：5+4+3+2+1=15.其实就是6个城市中任两个城市之间的距离.

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