Table:
0
A
B
C
D
E
F
1
Year
Mens singles
Womens singles
Mens doubles
Womens doubles
Mixed doubles
2
1995
Vitalii Sekerinau
Olga Koseli
Maxim Karpenko Vitalii Sekerianu
Marina Buruian Tatiana Gazia
Maxim Karpenko Marina Buruian
3
1996
Maxim Karpenko
Marina Buruian
Maxim Karpenko Vitalii Sekerianu
Marina Buruian Tatiana Gazia
Pavel Scicico Marina Buruian
4
1997
Vitalii Sekerianu
Marina Buruian
Maxim Karpenko Vitalii Sekerianu
Marina Buruian Tatiana Gazia
Maxim Karpenko Marina Buruian
5
1998
Maxim Karpenko
Marina Buruian
Maxim Karpenko Egor Ursatii
Marina Buruian Nadia Litvinenko
Maxim Karpanenko Marina Buruian
6
1999
Egor Ursatii
Nadejda Litvinenko
Maxim Karpenko Egor Ursatii
Marina Buruian Nadia Litvinenko
Maxim Karpanenko Nadia Litvinenko
7
2000
Egor Ursatii
Nadejda Litvinenko
Maxim Karpenko Egor Ursatii
Marina Buruian Nadia Litvinenko
Maxim Karpanenko Nadia Litvinenko
8
2001
Maxim Karpenko
Olga Kuzmenko
Maxim Karpenko Vladimir Cecoi
Nadia Litvinenko Olga Cosel
Maxim Karpanenko Nadia Litvinenko
9
2002
Maxim Karpenko
Olga Kuzmenko
Maxim Karpenko Egor Ursatii
Nadia Litvinenko Olga Kuzmenko
Maxim Karpenko Nadia Litvinenko

Questions and formulas:
Question: How many mixed doubles were there in the year that Olga Koseli won the women's singles?
Formula: ROWS(UNIQUE(FILTER(F1, C1="Olga Koseli")))
Formula2: ROWS(UNIQUE(FILTER(F2:F9, C2:C9="Olga Koseli")))
Level: medium