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esekvng4551
24.07.2021 •
Mathematics
Có 3 người làm xét nghiệm virus . Gọi A ,B,C lần lượt là kết quả người thứ nhất, thứ hai, thứ ba dương tính
a) kết quả người thứ hai âm tính
b) ít nhất có một kết quả xét nghiệm dương tính
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Ответ:
D
Step-by-step explanation: