CREATE TABLE table_73661 ("Episode no." FLOAT, "Airdate" TEXT, "Viewers" FLOAT, "BBC Three weekly ranking" TEXT, "Cable rank" TEXT)

What is the cable rank for bbc three weekly ranking of n/a?
SELECT "Cable rank" FROM table_73661 WHERE "BBC Three weekly ranking" = 'N/A'
SELECT "Cable rank" FROM "table_73661" WHERE "BBC Three weekly ranking" = 'N/A'