100 Lockers Puzzle

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4 Responses

  1. Manish says:

    The solution goes like this:
    All the lockers whose id numbers have even no. of factors (including 1 and themselves) will be closed, and the id’s with odd number of factors will be open.

    Now it can be seen that only Perfect Squares have odd no. of factors.
    Hence lockers 1, 4,9,16,25,36,49,64,81,100 will be open

  2. vatsal says:

    The open locker numbers ll be 3,4,5,7.
    As all other nos either includes themselves or they are being included in the series created by their factors …

  3. vatsal says:

    The open locker numbers ll be 3,4,5,7.
    As all other nos either includes themselves or they are being included in the series created by their factors …

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