CREATE TABLE table_25767 ("No. in series" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( millions ) " TEXT)

How many different titles are there of episodes that have been seen by 7.84 million people in the US/
SELECT COUNT("Title") FROM table_25767 WHERE "U.S. viewers (millions)" = '7.84'
SELECT COUNT("Title") FROM "table_25767" WHERE "U.S. viewers (millions)" = '7.84'