Table:
0
A
B
C
D
E
1
id
name
stadium id
year
event
2
1
FINA
1
2016
3
2
Pacific
10
2011
4
3
World Master
2
2012
5
4
World Junior
3
2013
6
5
IPC
4
2014
7
6
European FINA
8
2017

Questions and formulas:
Question: How many events are there?
Formula: ROWS(UNIQUE(E1))
Formula2: ROWS(UNIQUE(E2:E7))
Level: easy
Question: The number of events.
Formula: ROWS(UNIQUE(E1))
Formula2: ROWS(UNIQUE(E2:E7))
Level: easy