Lz 可否翻译下这题? City A City B City C City D City E City A ? ? ? ? City B ? ? ? City C ? ? City D ? City E 116. 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? (A) 60 (B) 435 (C) 450 (D) 465 (E) 900 -- by 会员 Eileenl (2010/10/19 22:50:42)
答案是435 意思就是那些店5个城市两两之间的距离 5个城市需要10个点 那么30个城市需要多少个? 就是从1加到29 435个 或者C30 2 |