It works perfectly fine for me!!

Code:
SQL> CREATE PUBLIC ROLLBACK SEGMENT RBS01     TABLESPACE RBS     STORAGE ( INITIAL 512K 
NEXT 512K MINEXTENTS 10 MAXEXTENTS 505);

Rollback segment created.

SQL> CREATE PUBLIC ROLLBACK SEGMENT "RBS02"     TABLESPACE RBS     STORAGE ( INITIAL 512K 
NEXT 512K MINEXTENTS 10 MAXEXTENTS 505);

Rollback segment created.

SQL> select segment_name,MIN_EXTENTS,MAX_EXTENTS  from sys.dba_rollback_segs;
SYSTEM                                   2         505
RBS0                                     8        4096
RBS1                                     8        4096
RBS2                                     8        4096
RBS3                                     8        4096
RBS4                                     8        4096
RBS5                                     8        4096
RBS6                                     8        4096
RBS7                                     8        4096
RBS01                                   10         505
RBS02                                   10         505

11 rows selected.