- One of his friends house
- One of his friend's house
- One of his friends' house
Which is correct?
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"One of his friends' house" is the correct one.
Note: When 'One of' acts as the subject of a clause it is followed by a plural noun and a singular verb.
singular noun + 's - His friend's house.
regular plural noun + ' - His friends' house.
irregular plural noun + 's - His children's house.