Question

В книге 120 страниц. Сколько цифр напечатали для нумерации, начиная с третьей страницы? Спасибо.

Answer 1

С 3 по 9 =7 цифр.
с 10 по 99 90 чисел по 2 цифры =180 цифр.
с 100 по 120 21 число по 3 цифры = 63 цифры. Всего 250 цифр.

Answer 2

Calculation of the Number of Digits for Numbering Pages in a 120-Page Book

To calculate the number of digits required for numbering the pages in a 120-page book, we need to consider the following:

1. The book has 120 pages. 2. The numbering starts from the third page.

To calculate the number of digits required, we can follow these steps:

1. Determine the number of pages that will have a single digit page number. 2. Determine the number of pages that will have a two-digit page number. 3. Determine the number of pages that will have a three-digit page number.

Let's calculate each of these steps:

1. Number of pages with a single-digit page number: - The first two pages will have page numbers 1 and 2, respectively. - Therefore, there are 2 pages with a single-digit page number.

2. Number of pages with a two-digit page number: - The remaining pages from the third page to the 99th page will have two-digit page numbers. - Therefore, there are 97 pages with a two-digit page number.

3. Number of pages with a three-digit page number: - The remaining pages from the 100th page to the 120th page will have three-digit page numbers. - Therefore, there are 21 pages with a three-digit page number.

Now, let's calculate the total number of digits required:

- Pages with a single-digit page number: 2 pages * 1 digit = 2 digits - Pages with a two-digit page number: 97 pages * 2 digits = 194 digits - Pages with a three-digit page number: 21 pages * 3 digits = 63 digits

Therefore, the total number of digits required for numbering the pages in a 120-page book, starting from the third page, is:

2 digits + 194 digits + 63 digits = 259 digits.

Please note that the calculation assumes that each page number occupies one digit, regardless of leading zeros.