Q22:
A certain company assigns employees to offices in such a way
that some of the offices can be empty and more than one employee
can be assigned to an office. In how many ways can the company
assign 3 employees to 2 different offices?
A. 5
B. 6
C. 7
D. 8
E. 9
Answer:D
如果放法是(room1,room2)，有(3,0) (2,1) (1,2) (0,3)只有四種啊@@"
為什麼是八種呢？謝謝~
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Q28:
Last Sunday a certain store sold copies of Newspaper A for $1.00
each and copies of Newspaper B for $1.25 each, and the store sold
no other newspapers that day. If r percent of the store’s revenues
from newspaper sales was from Newspaper A and if p percent of the
newspapers that the store sold were copies of newspaper A, which
of the following expresses r in terms of p?
A. 100p / (125 – p)
B. 150p / (250 – p)
C. 300p / (375 – p)
D. 400p / (500 – p)
E. 500p / (625 – p)
Answer:D
這題沒有idea ..>< 請高手幫忙^^
謝謝~
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