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20 boys and 40 girls are in Group A, while at least 7 boys, together with some girls are in Group B. To choose one person from each of the group, the probability that both are boys is no greater than $$\frac{1}{15}$$. Which of the following statements must be true?
Indicate all such statements.
A显示答案
· 相关考点
6.4.3 独立事件 3.5.6 不等式应用题
6.4.3 独立事件
3.5.6 不等式应用题
以上解析由 考满分老师提供。
