Table:
0
A
B
C
D
E
F
1
District
Incumbent
Party
First elected
Results
Candidates
2
Washington 1
Jay Inslee
Democratic
1998
Re-elected
Jay Inslee (D) 67.7% Larry Ishmael (R) 32.3%
3
Washington 2
Rick Larsen
Democratic
2000
Re-elected
Rick Larsen (D) 64.2% Doug Roulstone (R) 35.8%
4
Washington 3
Brian Baird
Democratic
1998
Re-elected
Brian Baird (D) 63.1% Michael Messmore (R) 36.9%
5
Washington 4
Doc Hastings
Republican
1994
Re-elected
Doc Hastings (R) 59.9% Richard Wright (D) 40.1%
6
Washington 5
Cathy McMorris
Republican
2004
Re-elected
Cathy McMorris (R) 56.4% Peter Goldmark (D) 43.6%
7
Washington 6
Norm Dicks
Democratic
1976
Re-elected
Norm Dicks (D) 70.6% Doug Cloud (R) 29.4%

Questions and formulas:
Question: Who is the incumbent in the Washington 1 district? 
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,A1="Washington 1"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F7,A2:A7="Washington 1"),2))
Level: medium
Question: How many categories of first elected are in Washington 4 district? 
Formula: ROWS(UNIQUE(FILTER(D1, A1="Washington 4")))
Formula2: ROWS(UNIQUE(FILTER(D2:D7, A2:A7="Washington 4")))
Level: medium
Question: What was the result in the election where the date of first elected was 2000? 
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,D1=2000),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F7,D2:D7=2000),5))
Level: medium