prep-ps1-149 + prep-ps1-75

aidi_more

prep-ps1-149149.      15609-!-item-!-187;#058&010412

A certain library assesses fines for overdue books as follows.  On the first day that a book is overdue, the total fine is $0.10.  For each additional day that the book is overdue, the total fine is either increased by $0.30 or doubled, whichever results in the lesser amount.  What is the total fine for a book on the fourth day it is overdue?

 

 

(A) $0.60

(B) $0.70

(C) $0.80

(D) $0.90

(E) $1.00

为什么是B?

第四天就应该罚4days' fine啊？！常识就是这样啊，我经常被美国的图书馆罚钱

[此贴子已经被作者于2008-8-19 12:23:43编辑过]

aidi_more

75.        8939-!-item-!-187;#058&006136

A certain law firm consists of 4 senior partners and 6 junior partners.  How many different groups of 3 partners can be formed in which at least one member of the group is a senior partner?  (Two groups are considered different if at least one group member is different.)

 

(A) 48

(B) 100

(C) 120

(D) 288

(E) 600

这个题，更是没有读懂……

jessieguan

这个答案确定是对的么？

还有whichever results in the lesser amount，我觉得doubled那个比较lesser啊。。。

我数学不好

jessieguan

这个答案是什么？

aidi_more

prep答案149 B , 75 B

aidi_more

75 自己想明白了，最后括号里的话是干扰人用的，无视就好了

rearn

75题

C1/4 * C2/6 + C2/4 * C1/6 + C3/4 = 100