Number of Ethnicities in the World
It’s NOT safe to assume that each language is spoken by ONLY one ethnic group, because many groups would be double counted.
Some different ethnic communities share the same language, while many groups practice more than one language. Some groups use a separate language for business trades. And some ethnic groups have separate language variations, although they share the same ethnicity.
Ethnologue also includes many sign languages (+25), but deaf and mute people are not separate ethnic groups. So the conclusion is wrong.
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