Question

What is the total no. of digits printed, if a book containing 150 pages is to be numbered from 1 to 150?

Answer 1

numbers from
1 to 9=9
10 to 99=90
100 to 150=51

Total no.of digits from
1 to 9=1×9=9

10 to 99=2×90=180

100 to 150=3×51=153

Total no. of digits containing 150 pages=9+180+153=342