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Among 350 card, cards No.100 to No.299 are red. Among all red cards, cards that end with 4, 5, 6, 7, 8, 9 and 0 are round. What is the probability that a red round card is selected when randomly selecting a card from all 350 cards?
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· 相关考点
6.3.1 基本计数原理与加法原理
6.3.1 基本计数原理与加法原理
以上解析由 考满分老师提供。
