Table:
0
A
B
C
D
E
F
1
Series #
Episode #
Title
Directed by
Written by
Original air date
2
1
1
"Episode 1"
Charles McDougall
Russell T. Davies
23 February 1999
3
1
2
"Episode 2"
Charles McDougall
Russell T. Davies
2 March 1999
4
1
3
"Episode 3"
Charles McDougall
Russell T. Davies
9 March 1999
5
1
4
"Episode 4"
Charles McDougall
Russell T. Davies
16 March 1999
6
1
5
"Episode 5"
Sarah Harding
Russell T. Davies
23 March 1999
7
1
6
"Episode 6"
Sarah Harding
Russell T. Davies
30 March 1999
8
1
7
"Episode 7"
Sarah Harding
Russell T. Davies
6 April 1999

Questions and formulas:
Question: How many titles does Episode 2 have
Formula: ROWS(UNIQUE(FILTER(C1, B1=2)))
Formula2: ROWS(UNIQUE(FILTER(C2:C8, B2:B8=2)))
Level: medium
Question: What is the title of Episode #2
Formula: LET(query1,SUMMARIZE(C1,SUMX(B1)),FILTER(query1,CHOOSECOLS(query1,2)=2))
Formula2: LET(query1,SUMMARIZE(C2:C8,SUMX(B2:B8)),FILTER(query1,CHOOSECOLS(query1,2)=2))
Level: hard
Question: How many directors did Episode #3 have
Formula: ROWS(UNIQUE(FILTER(D1, B1=3)))
Formula2: ROWS(UNIQUE(FILTER(D2:D8, B2:B8=3)))
Level: medium