Mathematics
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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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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