Table:
0
A
B
C
D
E
F
G
1
Version
Dock Connection
AUX In
Battery
iPhone Certified
Video Out
Dual Voltage
2
SoundDock series I
FireWire
No
No
No
No
Yes
3
SoundDock series I v2
USB
No
No
Yes
No
Yes
4
SoundDock series II
USB
Yes
No
Yes
No
Yes
5
SoundDock series III
Lightning
Yes
No
Yes
No
Yes
6
SoundDock Portable
USB
Yes
Yes
No
No
Yes
7
SoundDock Portable v2
USB
Yes
Yes
Yes
No
Yes

Questions and formulas:
Question: How many times did the sounddock series II aux in?
Formula: ROWS(UNIQUE(FILTER(C1, A1="SoundDock series II")))
Formula2: ROWS(UNIQUE(FILTER(C2:C7, A2:A7="SoundDock series II")))
Level: medium
Question: Was the sounddock series I v2 iphone certified?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,A1="SoundDock series I v2"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G7,A2:A7="SoundDock series I v2"),5))
Level: medium
Question: How many connections aux in using FIrewire?
Formula: ROWS(UNIQUE(FILTER(C1, B1="FireWire")))
Formula2: ROWS(UNIQUE(FILTER(C2:C7, B2:B7="FireWire")))
Level: medium
Question: how many video out connections does the sounddock portable have?
Formula: ROWS(UNIQUE(FILTER(F1, A1="SoundDock Portable")))
Formula2: ROWS(UNIQUE(FILTER(F2:F7, A2:A7="SoundDock Portable")))
Level: medium
Question: Does the sounddock series I v2 have dual voltage?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,A1="SoundDock series I v2"),7))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G7,A2:A7="SoundDock series I v2"),7))
Level: medium
Question: What type of dock connection does the sounddock series III have? 
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,A1="SoundDock series III"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G7,A2:A7="SoundDock series III"),2))
Level: medium