有红、黄、白三种颜色,并各标有字母A、B、C、D、E的卡片15张,今随机一次取出4张。则4张卡片标号不同,颜色齐全的概率是:A.12/91 B.18/9...

作者: tihaiku 人气: - 评论: 0
问题 有红、黄、白三种颜色,并各标有字母A、B、C、D、E的卡片15张,今随机一次取出4张。则4张卡片标号不同,颜色齐全的概率是:
选项 A.12/91 B.18/91 C.24/91 D.30/91
答案 A
解析 (1)先不考虑颜色,从标有A、B、C、D、E的5张卡片中取4张,标号各不相同的情况共有

相关内容:有红,白三种,颜色,字母,卡片,标号,概率

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