CREATE TABLE table_27673 ("Season" FLOAT, "Series" TEXT, "Team Name" TEXT, "Races" FLOAT, "Wins" FLOAT, "Points" TEXT, "Final Placing" TEXT)

In what season was the final placing NC and the team SL Formula Racing?
SELECT "Season" FROM table_27673 WHERE "Final Placing" = 'NC†' AND "Team Name" = 'SL Formula Racing'
SELECT "Season" FROM "table_27673" WHERE "Final Placing" = 'NC†' AND "Team Name" = 'SL Formula Racing'