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The number of colors a person can see depends on the individual and their level of color vision. A person with normal color vision, known as trichromacy, can see up to 7 million different colors. This is because they have three types of color receptors in their eyes, which are sensitive to red, green, and blue light. These receptors allow the person to perceive a broad range of colors.
People with color blindness, on the other hand, may only be able to see a few thousand colors. This is because they have fewer types of color receptors in their eyes, or their receptors are not as sensitive. For example, someone with protanopia (red-green color blindness) may only be able to see about 1,000 colors.
In conclusion, the number of colors a person can see depends on their level of color vision. People with normal color vision can see up to 7 million colors, while people with color blindness may only be able to see a few thousand.