Table:
0
A
B
C
D
E
1
Species
Indole
Methyl Red
Voges-Proskauer
Citrate
2
Escherichia coli
Positive
Positive
Negative
Negative
3
Shigella spp.
Negative
Positive
Negative
Negative
4
Salmonella spp.
Negative
Positive
Negative
Positive
5
Klebsiella spp.
Negative
Negative
Positive
Positive
6
Proteus vulgaris
Positive
Positive
Negative
Negative
7
Proteus mirabilis
Negative
Positive
Negative
Positive

Questions and formulas:
Question: What is the result for salmonella spp. if you use citrate?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="Salmonella spp."),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,A2:A7="Salmonella spp."),5))
Level: medium
Question: Which species show a negative result with both voges-proskauer and indole?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(D1="Negative")*(B1="Negative")),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,(D2:D7="Negative")*(B2:B7="Negative")),1))
Level: medium
Question: What are the results for testing the species with voges-proskauer when citrate yields a positive result?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="Positive"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,E2:E7="Positive"),4))
Level: medium
Question: What is the result of proteus mirabilis tested with indole?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="Proteus mirabilis"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,A2:A7="Proteus mirabilis"),2))
Level: medium