CREATE TABLE table_25421463_1 (season VARCHAR, final_placing VARCHAR, team_name VARCHAR)

In what season was the final placing NC and the team SL Formula Racing?
SELECT season FROM table_25421463_1 WHERE final_placing = "NC†" AND team_name = "SL Formula Racing"
SELECT "season" FROM "table_25421463_1" WHERE "NC†" = "final_placing" AND "SL Formula Racing" = "team_name"