The difference is how they can be used in a sentence. " is correct. "The French" refers to all of them.
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CAMPBELLWe often would use "a French person" eg. "there is a French person living in my house", because this is neutral (not male or female), ore more colloquially - " A French guy" or "a French girl" -Just a question: in these case, I think that the word "french" is an adjective. aren't we talking about the noun "french"?