CREATE TABLE table_name_21 (production_number VARCHAR, series VARCHAR, title VARCHAR)

What is the production number for Bell Hoppy in the MM Series?
SELECT COUNT(production_number) FROM table_name_21 WHERE series = "mm" AND title = "bell hoppy"
SELECT COUNT("production_number") FROM "table_name_21" WHERE "bell hoppy" = "title" AND "mm" = "series"