Table:
0
A
B
C
D
E
F
G
1
Series
Episodes
Series premiere
Series finale
Region 1
Region 2
Region 4
2
Pilot
1
18 February 2008
18 February 2008
N/A
N/A
N/A
3
1
6
25 January 2009
1 March 2009
20 July 2010
20 April 2009
6 August 2009
4
2
8
10 January 2010
28 February 2010
21 September 2010
12 April 2010
5 August 2010
5
3
8
23 January 2011
13 March 2011
3 May 2011
28 March 2011
5 May 2011
6
4
8
5 February 2012
25 March 2012
15 January 2013
23 April 2012
7 June 2012

Questions and formulas:
Question: Which episode was N/A in region 1
Formula: SUMIFS(B1,E1,"N/A")
Formula2: SUMIFS(B2:B6,E2:E6,"N/A")
Level: easy
Question: When was series premiere on the pilot episode
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,A1="Pilot"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,A2:A6="Pilot"),3))
Level: medium
Question: What is the region 1 date for series 4
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,A1="4"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,A2:A6="4"),5))
Level: medium
Question: How many episodes in the series that premieres 5 february 2012
Formula: SUMIFS(B1,C1,"5 February 2012")
Formula2: SUMIFS(B2:B6,C2:C6,"5 February 2012")
Level: easy