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    Question

    data-sheets-value="{"1":2,"2":"How many digits are required to write first 200 natural numbers?"}" data-sheets-userformat="{"2":769,"3":{"1":0},"11":4,"12":0}">How many digits are required to write first 160 natural numbers?
    A 362 Correct Answer Incorrect Answer
    B 370 Correct Answer Incorrect Answer
    C 372 Correct Answer Incorrect Answer
    D 272 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Single digit numbers are from 1 to 9 so in that total digits used = 9. From 10 to 99 there are 90 numbers of 2 digits, so here digit used = 90 x 2 = 180 From 100 to 160 there are 61 numbers of 3 digits = 3 x 61 = 183 (as all are of 3 digit number). So number of digits required to first 160 natural number = 9 + 180 + 183 = 372

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