Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_24057191_2 (end_date VARCHAR, average_viewers__millions_ VARCHAR)
### Question:
How many different end dates are there for the series seen by 4.2 million people?
### Answer:
SELECT COUNT(end_date) FROM table_24057191_2 WHERE average_viewers__millions_ = "4.2"