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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
1 answer:
sergeinik [125]2 years ago
7 0

Answer:

ehfsxuefoenircuducrusxnrim

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