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I'm not sure which is correct. Feedback is appreciated.
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It depends on context.

boys- plural of boy

boy's - possessive of one boy

boys' - possessive of more than one boy
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which one is correct boys hostel, boy's hostel or boys' hostel?

boys' hostel

Boys hostel or boy''s hostel or boys'
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Anonymous Boys hostel or boy''s hostel or boys'

What seems to be the problem? Are you unable to see Mister Micawber's answer to this question in the thread?

CJ