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-   -   Difficult math problem: (https://www.askmehelpdesk.com/showthread.php?t=835482)

  • Nov 12, 2017, 11:41 AM
    Cowdog
    Difficult math problem:
    How many times do write digit 1 if you write all possible natural numbers up to seven digits using digits 0 and 1 only?
  • Nov 12, 2017, 11:45 AM
    smoothy
    What do you think and why?

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