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There are 100 lockers, all closed. On the first pass you alter the state of all lockers (ie closed -> open; open -> closed). On the second you alter the state of every second locker, and so on until you make 100 passes. Which lockers remain open after?
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Software Engineering Intern

Interviewed at TellApart

5
Nov 7, 2013

There are 100 lockers, all closed. On the first pass you alter the state of all lockers (ie closed -> open; open -> closed). On the second you alter the state of every second locker, and so on until you make 100 passes. Which lockers remain open after?

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