Question
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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