user: Question: Name the number of viewers for series number 50
Columns: ['Series #', 'Season #', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (in millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [45.0, 1.0, '"The Long Way Down Job"', 'Dean Devlin', 'Joe Hortua & John Rogers', 'June26,2011', '3.42']
SQL:

assistant: SELECT "U.S. viewers (in millions)" FROM "Table" WHERE "Series #" = 50.0;