What episode number of the season was also number 75 in the series?
CREATE TABLE "table1_23242968_1" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text,
  "u_s_viewers_millions" text
);
SELECT MAX("no_in_season") FROM "table1_23242968_1" WHERE "no_in_series"=75;