



C(3, 2) * (20/35)^2 * (15/35)^1 122
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$34.99
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một hộp chứa 35 quả cầu gồm 20 quả cầu đỏ
- Nếu có 3 hộp như vậy, tổng số quả cầu không đỏ là bao nhiêu?
- Có 166
- Nếu lấy ngẫu nhiên hai quả cầu liên tiếp mà không hoàn lại, xác suất cả hai quả đều đỏ là bao nhiêu?
- 20/34 179
- Có bao nhiêu tập con gồm 2 quả cầu không đỏ có thể được chọn từ các quả cầu không đỏ?
- P(đỏ, không đỏ) + P(không đỏ, đỏ) = (20/35)*(15/34) + (15/35)*(20/34) 104
- Bài toán này thuộc loại bài toán xác suất nào?
- (20/35)^5 94
- 20 - 15 = 5 57
- C(35, 3) = 6545 149
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