Question

(Даю 70 баллов!!!) В классе 13 детей. Сколько есть способов выделить из них 3 человек, которые будут убирать в кабинете, а из оставшихся выбрать троих, которые будут убирать на следующей неделе?

Answer 1

Ответ дудвдвдвдвдвддвжужужужужуду

Answer 2

Ответ:

10+9+8=27способов

Пошаговое объяснение:

смотри, я тоже решаю. Крч, первое условие это 3 человека, т.е. 13,12,11 ребенка соответственно. Они нас не интересуют, а интересуют оставшиеся 10, из них можно выбрать 3 по принципу: 10+9+8=27способов

какие задачи ты уже решил? Зайди в мой профиль, помоги пж

Answer 3

Calculation of the Number of Ways to Select 3 Students for Cleaning the Classroom and Another 3 for the Following Week

To calculate the number of ways to select 3 students for cleaning the classroom and another 3 for the following week, we can use the concept of combinations.

The number of ways to select 3 students out of 13 for cleaning the classroom can be calculated using the formula for combinations:

C(n, k) = n! / (k!(n-k)!)

Where: - n is the total number of students (13 in this case) - k is the number of students to be selected (3 in this case) - ! denotes the factorial operation

Let's calculate the number of ways to select 3 students for cleaning the classroom:

C(13, 3) = 13! / (3!(13-3)!)

C(13, 3) = 13! / (3! * 10!)

C(13, 3) = (13 * 12 * 11) / (3 * 2 * 1)

C(13, 3) = 286

So, there are 286 ways to select 3 students for cleaning the classroom.

Now, let's calculate the number of ways to select 3 students from the remaining 10 students for cleaning the following week:

C(10, 3) = 10! / (3!(10-3)!)

C(10, 3) = 10! / (3! * 7!)

C(10, 3) = (10 * 9 * 8) / (3 * 2 * 1)

C(10, 3) = 120

Therefore, there are 120 ways to select 3 students from the remaining 10 students for cleaning the following week.

To find the total number of ways to select 3 students for cleaning the classroom and another 3 for the following week, we multiply the two results:

Total number of ways = 286 * 120

Total number of ways = 34,320

So, there are 34,320 ways to select 3 students for cleaning the classroom and another 3 for the following week.

Please note that the above calculations assume that the order of selection does not matter and that each student can only be selected once.