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수를

number; move or method

→ 수
phrase Uncommon #12,553
number; move or method 수 can mean a number or count, or a move, method, or means, depending on context. 을 marks it as the object of the sentence.
KO: 참가자 수를 확인했어요.
EN: I checked the number of participants.

수를 써야 해요.

I have to write a number.

정확한 수를 몰라요.

I don't know the exact number.