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ly311299
2 năm trước
Có 4 loại thuốc I, 3 loại thuốc II. Hỏi có bao nhiêu cách điều trị cho 5 người bị bệnh A nếu mỗi người bị bệnh A cần 2 loại thuốc I và 1 loại thuốc II?
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