Table:
0
A
B
C
D
1
participant id
participant type code
participant details
participants
2
9
Organizer
Karlee Batz
3
26
Organizer
Vilma Schinner
4
28
Organizer
Lupe Deckow
5
36
Organizer
Kenyatta Kuhn
6
37
Participant
Miss Kaci Lebsack
7
38
Organizer
Macy Mayer DDS
8
60
Participant
Dewitt Walter
9
63
Participant
Prof. Michelle Maggio Jr.
10
64
Participant
Dr. Jaydon Renner
11
66
Participant
Justyn Lebsack
12
75
Participant
Berniece Weimann
13
86
Organizer
Neil Blick
14
90
Participant
Dedrick Ebert
15
96
Organizer
Miss Joyce Cremin
16
98
Participant
Dr. Kris Deckow

Questions and formulas:
Question: What are all the the participant ids, type code and details?
Formula: UNIQUE(HSTACK(A1,B1,C1))
Formula2: UNIQUE(HSTACK(A2:A16,B2:B16,C2:C16))
Level: easy
Question: How many participants belong to the type 'Organizer'?
Formula: ROWS(UNIQUE(FILTER(D1, B1="organizer")))
Formula2: ROWS(UNIQUE(FILTER(D2:D16, B2:B16="organizer")))
Level: medium