ankita said – Wed, 20 Aug 2008 10:56:54 -0000 ( Link )
There are 1000 closed lockers. There are 1000 students.
The first student comes in and opens every locker.
The second student REVERSES every second locker, i.e. closes lockers that are open and opens lockers that are closed.
The third student REVERSES every third locker, and so on.
The pattern continues until all 1000 students have done what they're supposed to do.At the end, how many lockers are still open?
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