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Tại một xí nghiệp có ba máy làm việc độc lập. Trong một ca, xác suất cần sửa chữa của từng máy lần lượt là 0,1; 0,15; 0,2. Tính xác suất để trong một ca:
a) Không có máy nào cần sửa chữa.
b) Có nhiều nhất hai máy cần sửa chữa.

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Tại một xí nghiệp có ba máy làm việc độc lập. Trong một ca, xác suất cần sửa chữa của từng máy lần...
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