Union of Arrays with Duplicates | why asked simple questions?

This is the approach discussed with solution to how to find number of items. When union within two objects takes place, may have or not duplicate entities within them. Approach is discussed but why such questions are asked within interview that is to be noted?

Problem link : https://www.geeksforgeeks.org/problems/union-of-two-arrays3538/1
Community : https://www.reddit.com/r/OBrutus
Github : https://github.com/KodeLoad/DailyKodePractice

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