Funny Puzzle

rishi0922
@rishi0922-a2xTAa โ€ข Oct 25, 2024

A professional college has a strange principal. On the first day, he & his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the college.

The principal asks the first student to go to every locker and open it.

Then he has the second student go to every second locker and close it.

The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it.

The fourth student does this to every fourth locker, and so on.


Then, the Question.....

After the process is completed with the thousand students, how many lockers are open?

Replies

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  • bharathpb

    @bharathpb-FtEhYi • Jul 17, 2010

    Finnaly you get a principal r@gg!ng studetns...

  • Somi

    @somi-KX2vNp • Jul 17, 2010

    i have a guess!! 898???

  • rishi0922

    @rishi0922-a2xTAa • Jul 18, 2010

    Hey bharathpb how you thought this type of answer, this a tricky question guy not the question to make a fool.
    And by the way principal dosen't take ragging.

  • rishi0922

    @rishi0922-a2xTAa • Jul 18, 2010

    And somi try it again.

  • bharatbhushan198

    @bharatbhushan198-fUdImx • Jul 26, 2010

    is 500 correct?

  • silverscorpion

    @silverscorpion-iJKtdQ • Jul 27, 2010

    Only the lockers numbered
    1,4,9,25,36,49,64,81,100,121,144,169,196,225,256,289,324,361,400,441,484,529,576,625,676,729,784,841,900,961
    will be open.

    These are the square numbers, and only those will be open at the end. U can check..
    So, there will be 31 lockers open finally..

  • rishi0922

    @rishi0922-a2xTAa • Jul 31, 2010

    yes silverscorpion you are right.

  • vinsocorp

    @vinsocorp-4fscJ8 • Aug 7, 2010

    Its gr8 question to solve..

  • marustech

    @marustech-CKSJnz • Aug 7, 2010

    i dont get .....so i need answer pls