No. 291 in Russian
участников
"Participants."
In a sentence
Количество участников растет с каждым годом.
The number of participants grows every year.
In this sentence, "участников" refers to participants in general and is in the genitive plural form because it's governed by the implied quantifier of "количество."
Маршрут был описан всем участникам перед началом.
The route was explained to all participants before the start.
Here, "участникам" is in the dative plural case to indicate the indirect object receiving the explanation.
Ты видел участников на фотографии?
Did you see the participants in the photograph?
In this example, "участников" is in the accusative plural form because it is the direct object of the verb "видел."
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