Mathematics, 15.06.2021 08:00 zahid79

có 5 hộp bóng đèn, trong đó gồm 2 loại hộp I và 3 loại hộp II. mỗi loại hộp I có 8 bóng chất lượng tốt và 2 bóng chất lượng kém. mỗi hộp loại II có 7 bóng chất lượng tốt và 3 bóng chất lượng kém. lấy ngẫu nhiên 1 hộp và từ hộp đó rút ra hai bóng đèn. xác suất để lấy được hai bóng chất lượng tốt là?

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có 5 hộp bóng đèn, trong đó gồm 2 loại hộp I và 3 loại hộp II. mỗi loại hộp I có 8 bóng chất lượng t...