CREATE TABLE table_29801 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT, "U.S. viewers  ( millions ) " TEXT)

Wha episode number in the series had 24.8 million u.s. viewers?
SELECT MIN("No. in series") FROM table_29801 WHERE "U.S. viewers (millions)" = '24.8'
SELECT MIN("No. in series") FROM "table_29801" WHERE "U.S. viewers (millions)" = '24.8'