[計量] 請問兩題數學..
1. Seven one-dollar bills are to be distributed among Lucia,
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 receives at least $3
Column B
The total number of ways to distribute the Bills
分配問題...我忘了T.T~
從幾個取幾個有多少取法這類的我會 可是分配的忘記了..
2.At a sale, the cost of each tie was reduced by 20 percent
and the cost of each belt was reduced by 30 percent.
Column A
The percent reduction on the total cost of 1 tie and 2 belts.
Column B
25%
我寫A...可是答案是D
為什麼無法比較呢?
麻煩幫解惑 感激不盡
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