أَلْفَا رَجُلٍ
ثَلَاثَةُ آلَافِ رَجُلٍ
Two thousand men — three thousand men.
Alfā is the dual construct; thalāthatu ālāfi uses a plural genitive “thousands”.
The final noun rajulin is singular genitive, as it is after a single alf.
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Two Thousand and Three Thousand
Number Nouns: Rules from One to One Thousand
أَلْفَا رَجُلٍ
ثَلَاثَةُ آلَافِ رَجُلٍ
Two thousand men — three thousand men.
Alfā is the dual construct; thalāthatu ālāfi uses a plural genitive “thousands”.
The final noun rajulin is singular genitive, as it is after a single alf.