CREATE TABLE "table1_21994729_3" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "prod_code" text
);

Question: how many maximum series number have 2apx05 prod. code.
SQL: SELECT MAX("series_num") FROM "table1_21994729_3" WHERE "prod_code"='2APX05';

Question: What are all the title directed by reginald hudlin
SQL: SELECT COUNT("title") FROM "table1_21994729_3" WHERE "directed_by"='Reginald Hudlin';

Question: reginald hudlin directed how many written by.
SQL: SELECT "written_by" FROM "table1_21994729_3" WHERE "directed_by"='Reginald Hudlin';