2019_Qn A9, The number of time the digit 5 will appear while writing the integers from 1 to 1000.

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  • Опубликовано: 30 окт 2024

Комментарии • 35

  • @AbdusCSATMATH
    @AbdusCSATMATH  2 года назад

    Consider numbers from 1-999. (There is no digit five in number 1000).
    Numbers that has unit place digit =5:
    Digits possible in hundred's place are (0,1,2,3,4,5,6,7,8 and 9). Select one digit out of these 10 digits in 10C1 ways=10.
    Similarly, digits possible in ten's place are (0,1,2,3,4,5,6,7,8 and 9). Select one digit out of these 10 digits in 10C1 ways.
    Number of numbers with unit place digit is 5 = 10C1 × 10C1 ×1 =100.
    Similarly, number of numbers with ten's place digit is 5 = 10C1 × 1 × 10C1=100.
    And number of numbers with hundred's place digit is 5 = 1×10C1×10C1=100.
    Total digit five = 100+100+100=300

  • @bkworld3560
    @bkworld3560 5 месяцев назад

    Best solution

  • @jontyActs
    @jontyActs 2 года назад +3

    USE FORMULA (N * 10 POWER N-1) where N is the number of zeros so here it will be 3 zeros in thousand.

  • @ashwinis.s.8923
    @ashwinis.s.8923 3 года назад +5

    Thank you for giving the best solution and also very grateful to you for teaching in English 😇

    • @AbdusCSATMATH
      @AbdusCSATMATH  3 года назад +1

      Happy to share knowledge with you. Please like share and subscribe 😊

  • @rammohammadsinghaazad9308
    @rammohammadsinghaazad9308 Год назад +2

    sir why you counted 55 two times ? PS -> Thank u for csat initiative.

    • @AbdusCSATMATH
      @AbdusCSATMATH  Год назад +3

      In number 55, the digit five occurs in both unit's place and the hundred's place.

    • @AbdusCSATMATH
      @AbdusCSATMATH  Год назад

      Happy to share knowledge with you. Please like, share, and subscribe. :)

  • @jothikam7432
    @jothikam7432 7 месяцев назад +1

    Thank you

    • @AbdusCSATMATH
      @AbdusCSATMATH  7 месяцев назад

      Happy to share knowledge with you. Please like share and subscribe 😊.

  • @debasrita00
    @debasrita00 3 года назад +5

    Thanks for giving the best solutions 🙏🙏🥰

    • @AbdusCSATMATH
      @AbdusCSATMATH  3 года назад +1

      Happy to share knowledge with you. Please like, share and subscribe 😊.

  • @bhargavvenn
    @bhargavvenn Год назад +2

    Superb.

    • @AbdusCSATMATH
      @AbdusCSATMATH  Год назад

      Happy to share knowledge with you. Please like share and subscribe.

  • @sandeshade5817
    @sandeshade5817 2 года назад

    Tuch mastt sangitl bhau khup khup dhanywad

  • @devscorner2681
    @devscorner2681 10 месяцев назад

    Thank you sir

  • @priyanka5021
    @priyanka5021 6 месяцев назад +1

    550-559 m two times repeat ho rha vo add ni hoga ?

    • @kamalkaur7050
      @kamalkaur7050 5 месяцев назад

      Isme only 100th place wala five count Kiya hai means jo pehle a Raha hai jese 555 mai only pehla five count hoga 2nd five 10th place mai count ho chuka hai and 3rd five unit place par already count kr rkha hai isliye

  • @logasfederrer8022
    @logasfederrer8022 4 года назад +2

    What if the number replaced by other than 5,will get same numbers?

    • @AbdusCSATMATH
      @AbdusCSATMATH  4 года назад +2

      Except for digits 0 and 1 the result is same.👍

    • @janeniaaguilar6542
      @janeniaaguilar6542 4 года назад

      @@AbdusCSATMATH sir how about 1 ? can you explain it. I sthe process the same ?

    • @abdussalamtk2900
      @abdussalamtk2900 4 года назад

      @@janeniaaguilar6542 yes,
      1-999 , 300 digit 1 are there,
      In thousand one more digit 1,
      Then total = 300+1 =301

  • @Ammusee
    @Ammusee 3 года назад +2

    Super sir.. Can we do with the same method if they are asking like digit 2 is coming???

  • @KiranKhan-kz2dp
    @KiranKhan-kz2dp 2 года назад

    In the number 55 there r 2 fives so u counted wrong and what is the difference between a number and a digit

  • @beyourself8840
    @beyourself8840 Год назад

    🤕🤕🤕

  • @Kabir1801
    @Kabir1801 3 года назад

    It's consumes more time to go this lengthy method

  • @suhas5630
    @suhas5630 4 года назад +1

    Try to explain more question in 1 video.

  • @DecodingTatta
    @DecodingTatta 3 года назад +2

    Sir please reply😞😞😞....sir how 20*10? I think 20*9!

    • @AbdusCSATMATH
      @AbdusCSATMATH  3 года назад +3

      1-100
      101-200
      201-300
      301-400
      401-500
      501-600
      601-700
      701-800
      801-900
      901-1000
      Total ten sets are there 😊

  • @beirangiaphiapi452
    @beirangiaphiapi452 2 года назад

    Easy method but time consuming

  • @whatsinaname4570
    @whatsinaname4570 2 года назад

    You made it more complicated. Waste of time.

    • @AbdusCSATMATH
      @AbdusCSATMATH  2 года назад +1

      Consider numbers from 1-999. (There is no digit five in number 1000).
      Numbers that has unit place digit =5:
      Digits possible in hundred's place are (0,1,2,3,4,5,6,7,8 and 9). Select one digit out of these 10 digits in 10C1 ways=10.
      Similarly, digits possible in ten's place are (0,1,2,3,4,5,6,7,8 and 9). Select one digit out of these 10 digits in 10C1 ways.
      Number of numbers with unit place digit is 5 = 10C1 × 10C1 ×1 =100.
      Similarly, number of numbers with ten's place digit is 5 = 10C1 × 1 × 10C1=100.
      And number of numbers with hundred's place digit is 5 = 1×10C1×10C1=100.
      Total digit five = 100+100+100=300.

  • @zindadil9252
    @zindadil9252 3 года назад

    Sir I could not understand this

    • @AbdusCSATMATH
      @AbdusCSATMATH  3 года назад +1

      How many times digit will 5 appear while writing 1 to 1000.
      5, 15, 25, 35,45,55.....995
      Count all the digit 5, it’s equal to 300.