→ giyoshi:妳不假設用 賣p% 跟 1-p%算一樣可以 02/11 16:14
※ 引述《chia1985 (chia)》之銘言：
: 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~
你以為放球啊?XDDDDDD人是有名字 公司房間也不同XDDD
甲乙丙
甲乙 丙
乙丙 甲
甲丙 乙
甲 乙丙
乙 甲丙
丙 甲乙
甲乙丙
: ----------------------------------------------------------------------
: 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
設全部賣100份
A賣p份 B賣100-p份
r/100 = p / [p+(100-p)1.25] = 100p/125-0.25p = 400p/(500-p)
故...
: 這題沒有idea ..>< 請高手幫忙^^
: 謝謝~
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