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There are 100 doors in a building and 100 people outside. The first person goes in and opens every door. The second person goes in and closes every second door. The third person goes in and opens every third door. Which doors are the ones opened in the end?
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Data Analyst Intern

Interviewed at CareDash

4.5★
Sep 7, 2019

There are 100 doors in a building and 100 people outside. The first person goes in and opens every door. The second person goes in and closes every second door. The third person goes in and opens every third door. Which doors are the ones opened in the end?

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