Page numbering

The book has 88 pages. How many times is the number 4 used for the book numbering?

Correct result:

n =  19

Solution:

1c:4 X4:14,24,34,44,54,64,74,84 4X:40,41,42,43,44,45,46,47,48,49  n=1+8+10=19



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