Table:
0
A
B
C
D
E
F
1
Frequency
Station
Operator
Country of origin
Transmitter location
Format
2
5.965MHz (SW)
Radio Klasik
RTM
Malaysia
IBC , Malaysia
News and Music
3
15420kHz (SW)
Radio Free Sarawak
RFS
Malaysia
Unknown
News and Music
4
1242kHz
Voice of Vietnam
VOV
Vietnam
Can Tho , Vietnam
News and Music
5
1575kHz
Voice of America
VOA
United States of America
Bangkok , Thailand
News and Music
6
891kHz 981kHz
Sor. Wor. Thor
RTWS
Thailand
Saraburi (891) and Yala (981), Thailand
Talk , Music and News
7
684kHz
China Radio International
CRI
China
Hainan , China
News
8
918kHz
Radio Thailand Network Six
RTWS
Thailand
Bangkok , Thailand
News , Music
9
873kHz
Voice of Vietnam 4
VOV
Vietnam
Can Tho , Vietnam
Talks and Music
10
603kHz
China Radio International
CRI
China
Hainan , China
News
11
1503kHz
Radio Taiwan International
RTI
Taiwan
Fangliao , Taiwan
News

Questions and formulas:
Question: Which station has a frequency of 873khz?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,A1="873khz"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F11,A2:A11="873khz"),2))
Level: medium
Question: Where is the transmitter located for the station voice of vietnam
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="voice of vietnam"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F11,B2:B11="voice of vietnam"),5))
Level: medium
Question: Which station is from China and has a frequency of 684khz?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,(D1="china")*(A1="684khz")),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F11,(D2:D11="china")*(A2:A11="684khz")),2))
Level: medium