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taylor swift

31/03/2017 at 20:30
Answers
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How many numbers from 1 to 200 do not have the digit 2?


Permutation adn combination

    List of answers
  • ...
    Futeruno Kanzuki Coordinator 31/03/2017 at 20:49

    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 

  • ...
    Kokone 04/04/2017 at 14:18

    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 Hung 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 .

  • ...
    Indrace AD-MIN 07/04/2017 at 21:37

    The number of terms is:
    (200 - 1): 1 + 1 = 200 (number)

    We have:
    From 1 to 9 have a two digit number
    From 10 to 100 has 19 digits two
    From 101 to 200 there are 20 digits two
    So 1 to 200 are: 1 + 19 + 20 = 40 digits 2
    => Yes: 200 - 40 = 160 with no 2 digits

    Answer: 160

  • ...
    Thám Tử THCS Nguyễn Hiếu 31/03/2017 at 20:55

    The number of terms is:
    (200 - 1): 1 + 1 = 200 (number)

    We have:
    From 1 to 9 have a two digit number
    From 10 to 100 has 19 digits two
    From 101 to 200 there are 20 digits two
    So 1 to 200 are: 1 + 19 + 20 = 40 digits 2
    => Yes: 200 - 40 = 160 with no 2 digits

    Answer: 160

  • ...
    FA KAKALOTS 09/02/2018 at 21:44

    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

  • ...
    Lê Nho Khoa 02/04/2017 at 21:53

    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 

  • ...
    Number One 02/04/2017 at 06:22

    The number of terms is:
    (200 - 1): 1 + 1 = 200 (number)

    We have:
    From 1 to 9 have a two digit number
    From 10 to 100 has 19 digits two
    From 101 to 200 there are 20 digits two
    So 1 to 200 are: 1 + 19 + 20 = 40 digits 2
    Is is : 200 - 40 = 160 with no 2 digits

    Answer: 160



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