[20/11/2020]Lecture 3: Previous years CSAT questions based on Generalized Number System Concept

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23 thoughts on “[20/11/2020]Lecture 3: Previous years CSAT questions based on Generalized Number System Concept

  1. Mam plz finish the question first, so that we can also try solving that, in midst u start solving that doesn’t give us chance to try solving.. Plz consider as request

  2. Isn’t the answer should be 280 rather than 300…
    Bcz 9 groups of 20=180
    And the one excluded group(500to600) of 100 numbers
    Total180+100=280
    Plz correct me

    1. 180+100 (u understood) now, U have 5 as unit digits between 500 to 600 -10 times and 5 at tens place between 500 to 600- 10 times..so total times digit 5 used is…180+100+20=300

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