ثَلَاثُ صَفَحَاتٍ
رَأَيْتُ ثَلَاثَ صَفَحَاتٍ
Thalāth is the correct gender form for feminine pages in both examples.
It takes nominative or accusative case according to syntax.
Gender choice and case marking must be decided independently.
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Do Not Confuse Gender and Case
Number Nouns: Rules from One to One Thousand
ثَلَاثُ صَفَحَاتٍ
رَأَيْتُ ثَلَاثَ صَفَحَاتٍ
Thalāth is the correct gender form for feminine pages in both examples.
It takes nominative or accusative case according to syntax.
Gender choice and case marking must be decided independently.