الطَّالِبَانِ أَفْضَلُ الْقَوْمِ. / الطَّالِبَانِ أَفْضَلَا الْقَوْمِ.
When annexed to a definite noun, the elative can stay masculine singular or agree as a dual. Both sentences illustrate that choice.
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Definite Iḍāfah: Two Agreement Options
Ism al-Tafḍīl: Formation, Comparison, Agreement and Parsing
الطَّالِبَانِ أَفْضَلُ الْقَوْمِ. / الطَّالِبَانِ أَفْضَلَا الْقَوْمِ.
When annexed to a definite noun, the elative can stay masculine singular or agree as a dual. Both sentences illustrate that choice.