Pages counting

There are pages numbered from 2 to 104 in the book. How many digits have to be printed to number the pages?

Correct result:

n =  203

Solution:

n=1 (102)+2 (10010)+3 (104100+1)=203n=1 \cdot \ (10-2) + 2 \cdot \ (100-10)+3 \cdot \ (104-100+1)=203



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