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## A printer numbered consecutively the pages of a book, beginning with 1 on the first page. In numbering the pages, he had to print a total of 187 digits. Find the number of pages in the book. A) 99 B) 98 C) 96 D) 97 E) 95 (GMAT-MATHS)

## A printer numbered consecutively the pages of a book, beginning with 1 on the first page. In

numbering the pages, he had to print a total of 187 digits. Find the number of pages in

the book.

A) 99 B) 98 C) 96 D) 97 E) 95 (GMAT-MATHS)

Asked On2019-04-08 13:53:49 by:naikaumprakash

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Download question setAnswersLet's calculate how many digits would be printed if the book had 100 pages.

1-digit pages: 1, 2, 3, . . . 8, 9

TOTAL: 9 digits

2-digit pages: 10, 11, 12, 13, . . . 98, 99

Rule: The number of integers from x to y inclusive = y - x + 1

So, the number of integers from 10 to 99 inclusive = 99 - 10 + 1 = 90

Each of the 90 integers has 2 digits

TOTAL: (90)(2) = 180 digits

3-digit pages: 100

TOTAL: 3 digits

TOTAL number of digits from 1 to 100 = 9 + 180 + 3 = 192

The question tells us that only 189 digits were printed. So, we can conclude that the book has fewer than 100 pages

In fact, notice that our totals for 1-digit and 2-digit pages = 9 + 180 = 189

So, the book must have 99 pages altogether.

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