Mathematics, 15.08.2021 09:20 matthewdabber7

Có 30 đề thi trong đó có 10 đề khó và 20 đề trung bình. tìm xác xuất để a) Một học sinh bắt một đề gặp đucợ đề trinh 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 và 20 đề trung bình. tìm xác xuất để a) Một học sinh bắt một đề...

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Có 30 đề thi trong đó có 10 đề khó và 20 đề trung bình. tìm xác xuất để a) Một học sinh bắt một đề gặp đucợ đề trinh bình b) một học sinh bắt hai đề, được ít nhất một đề trung bình

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Another question on Mathematics

Có 30 đề thi trong đó có 10 đề khó và 20 đề trung bình. tìm xác xuất để a) Một học sinh bắt một đề gặp đucợ đề trinh bình
b) một học sinh bắt hai đề, được ít nhất một đề trung bình