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algol13
2 years ago
10
Có 30 đềthi trong đó có 10 đềkhó, 20 đềtrung bình. Tìm xác suất để:a)Một Học sinh bắt một đềgặp được đềtrung bình.b)Một Học sinh
bắt hai đề, được ít nhất một đềtrung bình
Mathematics
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sergeinik
[125]
2 years ago
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ehfsxuefoenircuducrusxnrim
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