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Mathematics, 09.09.2021 05:50 Gillo34
Bài 4. Một hộp đựng 5 quả cầu xanh, 4 quả cầu đỏ, 3 quả cầu vàng (Các quả cầu đôi một khác
nhau và mỗi quả chỉ mang một màu). Lấy ngẫu nhiên đồng thời 4 quả trong hộp.
a. Tính xác suất để 4 quả lấy ra có 2 quả đỏ, 1 quả xanh và 1 quả vàng.
b. Tính xác suất để 4 quả lấy được thuộc đúng 2 trong 3 màu nói trên.
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Bài 4. Một hộp đựng 5 quả cầu xanh, 4 quả cầu đỏ, 3 quả cầu vàng (Các quả cầu đôi một khác
nhau và...
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