No. 1,603 in Russian
трёх
"Трёх" means "three" (genitive or prefix form).
In a sentence
Я купил три книги, три ручки, и из них выбрал три из трёх для работы.
I bought three books, three pens, and chose three out of three for work.
Here, 'трёх' is used as the genitive plural form of 'three', indicating 'out of three'.
Эксперимент прошёл успешно благодаря участию трёх групп специалистов.
The experiment was successful thanks to the participation of three groups of specialists.
In this sentence, 'трёх' serves as the genitive case to define 'three groups'.
Посетители осмотрели три выставки и записали свои впечатления о трёх из них.
The visitors viewed three exhibitions and recorded their impressions of three of them.
This use of 'трёх' highlights selection or description of 'three of them', employing the word in a genitive plural context.
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