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phong7220
2 năm trước
Có 3 hộp phiếu bốc thăm trúng thưởng: Hộp 1 (17 phiếu trúng thưởng và 35 phiếu không trúng thưởng); Hộp 2 ( 20 phiếu trúng thưởng và 45 phiếu không trúng thưởng); Hộp 3 (13 phiếu trúng thưởng và 27 phiếu không trúng thưởng). Từ 3 hộp lấy ngẫu nhiên 2 hộp đổ chung lại với nhau rồi từ đó rút ngẫu nhiên 2 phiếu. Tính xác suất để trong 2 phiếu rút được có ít nhất 1 phiếu trúng thưởng?
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