In the phrase "Los cuadernos de las chicas," you already have both the appropriate definite article and the correct form of the noun.
Here’s a breakdown:
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"Los cuadernos" – "Los" is the correct masculine plural article for "cuadernos," which means "notebooks."
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"de las chicas" – "las" is the feminine plural article for "chicas," which means "girls." This part is referring to the girls’ notebooks.
So, the statement is correct as it is: "Los cuadernos de las chicas" means "The girls' notebooks."
If you wanted to mention "chicas" beforehand or add context, you would still keep "las" for "girls." The key is that you cannot replace "las" with "el" in this case, as "el" is singular and masculine.
If you meant to ask for a different structure or wording, please clarify!