Table:
0
A
B
C
D
E
1
Year
Entrant
Chassis
Engine
Points
2
1978
Mario Deliotti Racing
Ensign N175
Ford V8
0
3
1979
Candy Tyrrell Team
Tyrrell 009
Ford V8
0
4
1980
Shadow Cars
Shadow DN11
Ford V8
0
5
1980
Shadow Cars
Shadow DN12
Ford V8
0
6
1980
Unipart Racing Team
Ensign N180
Ford V8
0
7
1980
RAM Theodore
Williams FW07B
Ford V8
0
8
1982
Theodore Racing Team
Theodore TY02
Ford V8
0
9
1982
John Player Team Lotus
Lotus 91
Ford V8
0

Questions and formulas:
Question: Name the total number of years for chassis of ensign n175
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="ensign n175"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E9,C2:C9="ensign n175"),1))
Level: medium