Mask Policy

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A city has been infected by a contagious virus. In a survey, it was found that $A$ out of the $N$ people living in the city are currently infected. It has been observed that the only way for a person to get infected is if he comes in contact with an already infected person, and both of them are NOT wearing a mask. The mayor of the city wants to make a new Mask Policy and find out the minimum num

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