[計量] 一些猴哥計量的問題
第60題
In a bowl that contains 20 marbles, 7 are green, 6 are red, and the
remainder are blue. Two marbles are to be drawn at random from the bowl
without replacement.
column a)
the probability that one marble is green and the other is red
column b)
the probability that one marble is green and the other is blue
答案是B
我約略猜的出來會去選B
可是想知道比較正確的想法、算法
第73題
Seven one-doller bills are to be distributed among Licia, Gomez, and Domingo
so that each person receives at least $1.
column a)
the number of ways to distribute the bills so that at least one person receive
at least $3
column b)
the total number of ways to distribute the bills
這題答案是一樣(C)
不太清楚怎麼算@@
還有最後 第78題
At a sale, the cost of each tie was reduced by 20% and the cost of each belt
was reduced by 30%.
column a)
the percent reduction on the total cost of 1 tie and 2 belts
column b)
25%
答案是D(無法比較)
為什麼咧......?
以上三題 麻煩大家解答了~~
謝謝大家!
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10/20 19:14, , 1F
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※ 編輯: nyyfan0325 來自: 114.42.220.209 (10/23 22:01)
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04/13 23:51,
7年前
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04/13 23:51, 12F
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