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Ken has four bills in his wallet that are worth $1, $5, $10, and $20, respectively. How many different sums of money are possible in which one or more of these bills are used?
Indicate all such sums.
B,D显示答案
· 相关考点
6.3.5 组合 6.1.1 子集
6.3.5 组合
6.1.1 子集
以上解析由 考满分老师提供。
