a sequence 是由 26 个字母:21 个辅音 5 个元音中随机抽叏三个组成,问抽到的这三 个字母里有 at least 2 vowels 有多少种可能?
铅笔是我写的 绿色的是机经给出的答案 请老师指导我的思路的问题 多谢!
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ken@boost.org.cn
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If 500 is the mutiple of 100 that is closest to x and 400 is the multiple of 100 that is closest to y,which multiple of 100 is closest to x+y? (1)x小于500 (2)y小于400