CREATE TABLE "table1_27834100_1" (
  "series_num" real,
  "season_num" text,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "u_s_viewers_millions" text
);

Question: What is the episode number of "Dance Cards and Greeting Cards"?
SQL: SELECT MAX("series_num") FROM "table1_27834100_1" WHERE "title"='\"Dance Cards and Greeting Cards\"';