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Mathematics, 30.07.2021 04:20 isaiahcannon2803

Một bình có 10 bi ,trong đó có 3 bi đỏ 4 bi xanh 3 bi đen .Lấy ngẫu nhiên 4 viên bi tính xác suất để có 2 bi xanh

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Một bình có 10 bi ,trong đó có 3 bi đỏ 4 bi xanh 3 bi đen .Lấy ngẫu nhiên 4 viên bi tính xác suất để...
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