Table:
0
A
B
C
D
E
F
1
Province
School
City
Degree
Established
Closed
2
Ontario
Kingston Woman's Medical College
Kingston
MD
1883
1893
3
Ontario
Ontario Medical College for Women
Toronto
MD
1884
unknown
4
Ontario
Toronto School of Medicine
Toronto
MD
1847
1887
5
Ontario
Trinity Medical College
Toronto
MD
1853
1903
6
Ontario
Victoria University Medical Department
Toronto
MD
1853
1869
7
Québec
Laval University Medical Faculty
Montréal
MD
1878
1891
8
Québec
St. Lawrence School of Medicine
St. Lawrence
MD
1851
1852
9
Québec
University of Bishop College Faculty of Medicine
Montréal
MD
1870
1905

Questions and formulas:
Question: what province was established in 1870
Formula: LET(query1,SUMMARIZE(A1,SUMX(E1)),FILTER(query1,CHOOSECOLS(query1,2)=1870))
Formula2: LET(query1,SUMMARIZE(A2:A9,SUMX(E2:E9)),FILTER(query1,CHOOSECOLS(query1,2)=1870))
Level: hard