The number of digits that can be used to numbering a book of 600 pages is
A. 1542
B. 1692
C. 1748
D. 1618
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1 digit numbers : 1-9
2 digit numbers: 10-99
3 digit numbers: 100-600
Numbers of 1 digit numbers= 9 => digits used = 1*9 = 9.
Numbers of 2 digit numbers= 90 => digits used = 2*90 = 180.
Numbers of 3 digit numbers= 501 => digits used = 3*501 = 1503.
So, adding up all the results, we get 9+180+1503 = 1692.