somebody's else vs somebody else's , correct use ,

Rule -  Compound pronouns का possessive इसके अंतिम शब्द में अंतिम शब्द में Apostrophe ('s) लगाकर बनाई जाती है

     Example  
      Somebody   → Somebody's
            Anybody → Anybody's
         Everybody → Everybody's
Somebody else → Somebody else's
        Each other → Each other's
     One another → One another's

Question- :
    This car / is not mine ,/ It is    
    somebody's else / no error

Correct Sent- This car  is not mine ,It is  somebody else's

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