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Nguyen Van Hung

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  • Nguyen Van Hungliked an answer of question

    18/04/2017 at 21:33
  • Nguyen Van Hunganswered a question

    27/06/2017 at 20:34

    There are : (200 - 1) : 1 + 1 = 200 numbers from 1 to 200

    We have a sequence of two-digit numbers are as follows :

    2 ; 12 ; 22 ; 32 ; ....... ; 192

    Apply a formula to count numbers , we have :

    (192 - 2) : 10 + 1 = 20 

    There are also numbers with 2 digits such as

    20 ; 21 ; 23 ; 24 ; .... ; 29 ; 120 ; 121 ; 122 ; 123 ; ...... 129

    And there are have 18 also numbers .

    So , from these information , we have 38 numbers have digit 2

    We have :

    200 - 38 = 162 (numbers)

    There are 162 numbers from 1 to 200 do not have the digit 2 .

  • Nguyen Van Hungliked an answer of question

    27/06/2017 at 20:30
  • Nguyen Van Hungliked an answer of question

    27/06/2017 at 20:28
  • Nguyen Van Hungliked an answer of question

    27/06/2017 at 20:29
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