جَاءَ أَحَدَ عَشَرَ رَجُلًا.
رَأَيْتُ ثَلَاثَةَ عَشَرَ رَجُلًا.
The components of 11 and 13–19 are generally built on fatḥah.
The number’s grammatical position can change without changing those endings.
The first part of 12 is an important exception.
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Most Teen Compounds Are Fixed on Fatḥah
Number Nouns: Rules from One to One Thousand
جَاءَ أَحَدَ عَشَرَ رَجُلًا.
رَأَيْتُ ثَلَاثَةَ عَشَرَ رَجُلًا.
The components of 11 and 13–19 are generally built on fatḥah.
The number’s grammatical position can change without changing those endings.
The first part of 12 is an important exception.