Table:
0
A
B
C
D
E
F
1
Artist
Country
Number-one single(s)
Year
Weeks at #1
Straight to #1 ?
2
Paco
Viet Nam
"Amor de mis amores"
1988
5
No
3
Pagny, Florent
France
" N'importe quoi "
1988
8
No
4
Pagny, Florent
France
" Savoir aimer "
1997
9
No
5
Pagny, Florent
France
" Ma liberté de penser "
2003
6
No
6
Pakito
France
" Living on Video "
2004
4
No
7
Paradis, Vanessa
France
" Joe le taxi "
1987
11
No
8
Parker Jr., Ray
United States
" Ghostbusters "
1984
5
No
9
Parker, Tony
France
" Balance-toi "
2007
1
Yes
10
Passi
France
" Laisse parler les gens " 1
2003
3
No
11
Patti, Guesch
France
" Étienne "
1987
5
No
12
Pep's
France
"Liberta"
2009
2
Yes
13
Peter & Sloane
France
"Besoin de rien, envie de toi"
1984
9
No
14
Pietri, Julie
France
" Ève lève-toi "
1986
1
No
15
Pigloo
France
" Le Papa Pingouin "
2006
3
No
16
Pitbull
United States
" I Know You Want Me (Calle Ocho) "
2009
8
No
17
Plage, La
France
" Coup de Boule "
2006
3
No
18
M. Pokora
France
" Dangerous "
2008
1
Yes
19
Pow woW
France
" Le Chat "
1992
7
No
20
Product G&B, The
United States
" Maria Maria " 1
2000
4
No

Questions and formulas:
Question: What number-one single is performed by artist Pep's?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,A1="Pep's"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F20,A2:A20="Pep's"),3))
Level: medium