Question
Find the number of Digits required to write down the
number of Pages in a 500 page book?Solution
For one digit number 1 to 9 → 1 × 9 = 9 For two digit number 10 to 99 → 2 × 90 = 180 For three digit number 100 to 500 → 3 × 401 = 1203 Hence, total number of Required Digits = 9 + 180 + 1203 = 1392
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