The book says الْيَاءِ الْمَفْتُوحِ مَا قَبْلَهَا: the yāʾ has fatḥa on the letter immediately before it.
In طَالِبَيْنِ, the bāʾ has fatḥa, followed by a sākin yāʾ, while the final nūn has kasra.
Common error: The kasra on the final nūn is not the genitive case sign. In this class, yāʾ marks both accusative and genitive.
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Noun Case Classes: Type 5 — The Dual and Related Forms
The book says الْيَاءِ الْمَفْتُوحِ مَا قَبْلَهَا: the yāʾ has fatḥa on the letter immediately before it.
In طَالِبَيْنِ, the bāʾ has fatḥa, followed by a sākin yāʾ, while the final nūn has kasra.
Common error: The kasra on the final nūn is not the genitive case sign. In this class, yāʾ marks both accusative and genitive.