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The table lists the prices of all types of donuts available at Donut Shop J. How many different combinations of two donuts of different types can be purchased at Donut Shop J if the total of the prices of the two donuts must be less than $1.00?
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· 相关考点
6.3.5 组合
6.3.5 组合
以上解析由 考满分老师提供。