Câu 649: A bag contains 6 red balls, 4 blue balls, and 5 yellow balls. Two balls are drawn at random...

Question

Câu 649: A bag contains 6 red balls, 4 blue balls, and 5 yellow balls. Two balls are drawn at random at the same time. What is the probability that the two balls are of different colors? A. 90/105 B. 74/105 C. 65/105 D. 55/105

Accepted Answer

Câu 649 (VD): A bag contains 6 red balls, 4 blue balls, and 5 yellow balls. Two balls are drawn at random at the same time. What is the probability that the two balls are of different colors? A. 90/105 B. 74/105 C. 65/105 D. 55/105 Phương pháp giải: Sử dụng công thức tổ hợp và xác suất. Tổng số bóng: 6 đỏ + 4 xanh + 5 vàng = 15 bóng. Chọn 2 bóng bất kỳ: Giải chi tiết: Để 2 bóng khác màu, ta có các trường hợp: (Đỏ, Xanh), (Đỏ, Vàng), (Xanh, Vàng). Số cách chọn: (6 x4) + (6 x5) + (4 x5) = 24 + 30 + 20 = 74$. Xác suất: 74/105. Đáp án cần chọn là: B.

Câu 649: A bag contains 6 red balls, 4 blue balls, and 5 yellow balls. Two balls are drawn at random at the same time. What is the probabili...

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