مَفْتُوحَةٌ أَبَدًا إِنْ لَمْ يَكُنْ قَبْلَهَا أَلِفٌ.
Translation: The heavy nūn takes fatḥa whenever no alif precedes it.
The heavy nūn has fatḥa when no alif immediately precedes it, such as iḍribanna.
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When Heavy Nūn Has Fatḥa
The Two Emphatic Nūns: Forms and Rules
مَفْتُوحَةٌ أَبَدًا إِنْ لَمْ يَكُنْ قَبْلَهَا أَلِفٌ.
Translation: The heavy nūn takes fatḥa whenever no alif precedes it.
The heavy nūn has fatḥa when no alif immediately precedes it, such as iḍribanna.