Table:
text: The Cube (game show)
Transmissions
Transmissions
Series Start_date End_date Episodes Average_viewers_millions
1 22 August 2009 3 October 2009 7 5.09
2 19 September 2010 2 January 2011 12 4.95
3 3 April 2011 11 June 2011 9 3.72
4 30 October 2011 31 December 2011 9 4.2
5 14 April 2012 23 December 2012 9 3.26
6 2 March 2013 30 June 2013 13 3.66

Question: When did series 6 of The Cube (game show) start?

Question: Which series among the game shows The Cube was watched by an average of 3.72 million viewers?

Question: From The Cube (game show) list, how many different ending dates are there for the series watched by 4.2 million people?