DYNAMIC ARRAYS · ORIGINAL EXERCISE
A region appearing once
Return only region names in B2:B9 that occur exactly once. Preserve first appearance and use UNIQUE’s exactly_once option.
This quest practices UNIQUE exactly once using a fictional business dataset. Read the sheet below, then enter the interactive quest to write and check your formula.
| Order | Region | Product | Units | Revenue | Cost |
|---|---|---|---|---|---|
| O-101 | North | Keyboard | 12 | 720 | 420 |
| O-102 | South | Mouse | 18 | 450 | 198 |
| O-103 | North | Monitor | 5 | 1250 | 900 |
| O-104 | West | Keyboard | 8 | 480 | 280 |
| O-105 | South | Monitor | 4 | 1000 | 720 |
| O-106 | North | Mouse | 20 | 500 | 220 |
| O-107 | West | Monitor | 6 | 1500 | 1080 |
| O-108 | East | Dock | 10 | 600 | 350 |
Hints to get you started
- The second UNIQUE argument chooses rows versus columns.
- Keep by_col FALSE for a vertical list.
- Set the third argument to TRUE.
Show the worked solution
=UNIQUE(B2:B9,FALSE,TRUE)Distinct lists include one copy of every region. The exactly_once option instead excludes every value that repeats.
Make the skill stick
After solving the task, explain what each reference does and why the formula answers the business question. Try the workbook download inside the quest to practice in your own spreadsheet app.
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