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    Cowdog's Avatar
    Cowdog Posts: 1, Reputation: 1
    New Member
     
    #1

    Nov 12, 2017, 11:41 AM
    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?
    smoothy's Avatar
    smoothy Posts: 25,495, Reputation: 2853
    Uber Member
     
    #2

    Nov 12, 2017, 11:45 AM
    What do you think and why?

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