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phutit999
2 năm trước
Một hộp đựng 4 quả cầu đỏ và 5 quả cầu xanh .Chọn ngẫu nhiên 2 quả cầu . Xác suất để được 1 quả cầu đỏ và 1 quả cầu xanh là : A: 1/3 B: 5/9 C:2/3 D: 4/9 Trình bày ra giúp em với ạ
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