Table:
0
A
B
C
D
E
1
Release
# of discs
Region 1
Region 2
Region 4
2
Series I
2
25 February 2003
4 November 2002
3 December 2002
3
Series II
2
25 February 2003
10 February 2003
1 April 2003
4
Series III
2
3 February 2004
3 November 2003
18 November 2003
5
Series IV
2
3 February 2004
16 February 2004
9 March 2004
6
Just the Shows Vol. 1 Series 1-4 with no extras
4
N/A
18 October 2004
12 November 2004
7
Series V
2
15 March 2005
8 November 2004
1 December 2004
8
Series VI
2
15 March 2005
21 February 2005
6 April 2005
9
Series VII
3
10 January 2006
7 November 2005
1 December 2005
10
Series VIII
3
2 May 2006
27 March 2006
20 April 2006
11
The Complete Collection Series 1-8 with extras
18
5 September 2006
N/A
N/A
12
Just the Shows Vol. 2 Series 5-8 with no extras
6
N/A
2 October 2006
3 November 2006
13
Beat the Geek (Interactive DVD quiz game)
1
N/A
23 October 2006
3 March 2011
14
All the Shows Series 1-8 with no extras
10
N/A
10 November 2008
N/A
15
Back to Earth
2
6 October 2009
15 June 2009
17 December 2009
16
Just the Shows Series 1-8 with no extras
10
N/A
9 November 2009
N/A

Questions and formulas:
Question: How many DVDs where were in the complete collection series 1-8 with extras?
Formula: SUMIFS(B1,A1,"The Complete Collection Series 1-8 with extras")
Formula2: SUMIFS(B2:B16,A2:A16,"The Complete Collection Series 1-8 with extras")
Level: easy
Question: Which release had 6 DVDs?
Formula: LET(query1,SUMMARIZE(A1,SUMX(B1)),FILTER(query1,CHOOSECOLS(query1,2)=6))
Formula2: LET(query1,SUMMARIZE(A2:A16,SUMX(B2:B16)),FILTER(query1,CHOOSECOLS(query1,2)=6))
Level: hard
Question: How many region 1's did back to earth have?
Formula: ROWS(UNIQUE(FILTER(C1, A1="Back to Earth")))
Formula2: ROWS(UNIQUE(FILTER(C2:C16, A2:A16="Back to Earth")))
Level: medium