A man in a red shirt is standing next to a woman in a blue dress. They are both holding hands and smiling at each other. The number of people who have access to clean water has increased significantly over the past decade. However, it is still not universal. A person is wearing a red hat. They are also wearing a blue shirt. If they are not wearing a red hat, they are not wearing a blue shirt. If they are not wearing a blue shirt, they are not wearing a red hat. Does it logically follow that the person is not wearing a red hat?
yes
it is not possible to tell
no