以下是引用lemonleaf在2008-5-7 16:39:00的发言:哪位好心人帮我讲讲这几题啊,马上出门上战场了。。 48, 在1-100(inclusive)中既不能被2 也不能被3整除的数有几个 100-(50+33-16)=33 怎么算的啊 ? 53,涛涛28- Q33: 150, 200, 250, n Which of the following could be the median of the 4 integers listed above? I. 175 II. 215 III. 235 Answer: C. I and II only 这道题不是问中数吗,可是把175 和215带进去并不是4个数的中数啊。 73,有一个工厂对库存编号,前三位是数字允许重复,后三位字母不允许重复,一共多少库存 10^3*26*25*24 怎么算的啊 ? 73. 0-9 ten digit, can be repeated, so if the first is placed any number between 0-9,the second can also be placed by the number 0-9, so it is 10*10*10. The next alphabat the first can choose from 26 alphabets, the second can only choose from 25 alphabets, then 24. mingbai?? |