When did the season with 1 team format premiere?
CREATE TABLE table_1949994_7 (premiere_air_dates VARCHAR, format VARCHAR)
SELECT premiere_air_dates FROM table_1949994_7 WHERE format = "1 Team"
### Context: CREATE TABLE table_1949994_7 (premiere_air_dates VARCHAR, format VARCHAR) ### Question: When did the season with 1 team format premiere? ### Answer: SELECT premiere_air_dates FROM table_1949994_7 WHERE format = "1 Team"