user: Question: In what series did he have the 7th position? 
Columns: ['Season', 'Series', 'Team', 'Races', 'Wins', 'Poles', 'F.L.', 'Podiums', 'Points', 'Position']
Types: ['real', 'text', 'text', 'real', 'real', 'real', 'real', 'real', 'text', 'text']
Sample row: [2008.0, 'ADAC Formel Masters', 'Team Abt Sportsline', 16.0, 0.0, 1.0, 1.0, 3.0, '91', '8th']
SQL:

assistant: SELECT "Series" FROM "Table" WHERE "Position" = '7th';