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How many times is the digit written while listing all integers from to ?
The answer is 963.
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1 solution
Total 10s = 333, total 100s = 33, total 1000s = 3 ( Total = 369 ). For every 100s, there are 9 extra 0s = 9 33 = 297, for every 1000s, there are 99 extra 0s = 99 3 = 297( Total = 297 + 297 = 594 ) Total 0s = 369 + 594 = 963.