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Mathematics, 25.07.2021 06:00 ashcookie27
Có 30 đề thi trong đó có 10 đề khó, 20 đề trung bình. Tìm xác suất để:
a. Một học sinh bắt một đề gặp được đề trung bình.
b. Một học sinh bắt hai đề, được ít nhất một đề trung bình.
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Answers: 3
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Có 30 đề thi trong đó có 10 đề khó, 20 đề trung bình. Tìm xác suất để:
a. Một học sinh bắt một đề g...
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