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In a corridor with 100 lockers you pass the first time and open each locker. Then you pass the second time and you close each second locker. Subsequently, you pass the third time a toggle the state of each third locker, then you pass again each fourth, and so on... you repeat 100 times. How many lockers are open at the end.
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Quality Analyst

Interviewed at Goldman Sachs

3.7
May 10, 2012

In a corridor with 100 lockers you pass the first time and open each locker. Then you pass the second time and you close each second locker. Subsequently, you pass the third time a toggle the state of each third locker, then you pass again each fourth, and so on... you repeat 100 times. How many lockers are open at the end.

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