حَضَرَ ثَلَاثَةَ عَشَرَ طَالِبًا — Thirteen students attended.
ثَلَاثَةَ عَشَرَ: two-part numeral, fixed on fatḥ, in the nominative position as subject.
طَالِبًا: singular accusative tamyīz clarifying the number.
The specification after numbers 11–99 is normally singular and accusative. That is why we have «طَالِبًا», not «طَالِبُونَ». This is added teaching explanation, not a separate quoted rule from the source.
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Al-Murakkabāt — Compound Numerals, the Twelve Exception and Declining Baalbek
حَضَرَ ثَلَاثَةَ عَشَرَ طَالِبًا — Thirteen students attended.
ثَلَاثَةَ عَشَرَ: two-part numeral, fixed on fatḥ, in the nominative position as subject.
طَالِبًا: singular accusative tamyīz clarifying the number.
The specification after numbers 11–99 is normally singular and accusative. That is why we have «طَالِبًا», not «طَالِبُونَ». This is added teaching explanation, not a separate quoted rule from the source.