Question

На полке расставлены 7 книг, одинако 3 из них образуют 3-х томик. Все эти 3 тома данных стоят друг за другом и в опред порядке. Сколько существуют способов в расстановке книг? Срочно!​

Answer 1

вот это задача?

Пошаговое объяснение:

7-3=4(кн) на столе

ответ:4 книги

Answer 2

Calculation of the Number of Ways to Arrange the Books

To calculate the number of ways to arrange the books, we need to consider the following:

1. There are 7 books in total. 2. 3 of these books form a set of 3 volumes that are placed in a specific order.

To calculate the number of ways to arrange the books, we can treat the set of 3 volumes as a single entity. This means that we have 5 individual books and 1 set of 3 volumes.

The number of ways to arrange these books can be calculated using the formula for permutations. The formula for permutations is given by:

nPr = n! / (n - r)!

Where: - n is the total number of objects (books in this case) - r is the number of objects taken at a time (in this case, the number of objects in the set of 3 volumes)

Using this formula, we can calculate the number of ways to arrange the books as follows:

Number of ways = 7! / (7 - 3)!

Simplifying this expression:

Number of ways = 7! / 4!

Number of ways = (7 * 6 * 5 * 4 * 3 * 2 * 1) / (4 * 3 * 2 * 1)

Number of ways = 7 * 6 * 5

Number of ways = 210

Therefore, there are 210 different ways to arrange the books on the shelf.