Table:
0
A
B
C
1
project id
project details
projects
2
30
Society Research project
3
35
Internet of Things project
4
105
Graph Database project
5
134
Human Resource project
6
195
Population Research project

Questions and formulas:
Question: Show the number of projects.
Formula: ROWS(UNIQUE(C1))
Formula2: ROWS(UNIQUE(C2:C6))
Level: easy
Question: How many projects are there?
Formula: ROWS(UNIQUE(C1))
Formula2: ROWS(UNIQUE(C2:C6))
Level: easy
Question: List ids and details for all projects.
Formula: UNIQUE(HSTACK(A1,B1,C1))
Formula2: UNIQUE(HSTACK(A2:A6,B2:B6,C2:C6))
Level: easy
Question: What are the ids and details for each project?
Formula: UNIQUE(HSTACK(A1,B1,C1))
Formula2: UNIQUE(HSTACK(A2:A6,B2:B6,C2:C6))
Level: easy
Question: How many projects?
Formula: ROWS(UNIQUE(C1))
Formula2: ROWS(UNIQUE(C2:C6))
Level: easy
Question: What is the number of projects?
Formula: ROWS(UNIQUE(C1))
Formula2: ROWS(UNIQUE(C2:C6))
Level: easy
Question: What are the projects, ids and details?
Formula: UNIQUE(HSTACK(A1,B1,C1))
Formula2: UNIQUE(HSTACK(A2:A6,B2:B6,C2:C6))
Level: easy
Question: The projects, ids and details.
Formula: UNIQUE(HSTACK(A1,B1,C1))
Formula2: UNIQUE(HSTACK(A2:A6,B2:B6,C2:C6))
Level: easy
Question: How many projects do we have? 
Formula: ROWS(UNIQUE(C1))
Formula2: ROWS(UNIQUE(C2:C6))
Level: easy
Question: How many projects?
Formula: ROWS(UNIQUE(C1))
Formula2: ROWS(UNIQUE(C2:C6))
Level: easy