How can I retrive specied records in between a list

For example I have 100 records now i need to display from 20th record to 50th record. Please get me a solution.

select * from
( select rownum r, object_name from
( select * from dba_objects order by object_name)
where r between 20 and 50;

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    ENDFORM. " f_disp_errs
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