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Can you identify the cell numbers with ‘+’ sign?

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There was a prison consisting of 1000 cells numbered from 1 to 1000.

  • Each cell can be marked with ‘+’ or ‘-‘sign. Initially, all cells were marked with ‘-‘ sign.
  • From days 1 to 1000,the jailor toggles marks on the cell from + to – or vice versa.
  • On the i-th day ,the signs on cells that are multiples of i get toggled.
  • Now in the process of verification on 1001-th day, all cells marked with + signs are opened.

Can you identify the cell numbers with ‘+’ sign?

posted Jul 9, 2017 by Naveen Kumar

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