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There are 20 students in class with 10 girls and 10 boys. A teacher randomly selects some students and the first 6 students are all girls.
Quantity A
The probability that the 7th student is a girl
Quantity B
$$\frac{2}{7}$$
C显示答案
· 相关考点
6.4.1 古典概率
6.4.1 古典概率
以上解析由 考满分老师提供。
