Предмет: Математика, автор: dacenkoa550

БУДЬ ЛАСКА ПОТРІБНА ШВИДКА ДОПОМОГА.ДАЮ 50Б.

скільки різних чотирицифрових чисел можна скласти використовуючи цифри 0 2 7 8 9 якщо цифри 1)повторюються 2)не повторюються

Ответы

Автор ответа: vikaonikienko45
0

Відповідь:

Покрокове пояснення:

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dacenkoa550: Дякую
Автор ответа: tola123alot
1

Ответ:

Якщо цифри повторюються, то кожну з цифр можна використати в кожній з чотирьох позицій. Таким чином, кількість можливих чисел буде дорівнювати:

5*5*5*5=625

Отже, можна скласти 625 різних чотирицифрових чисел з цифр 02789, якщо цифри повторюються.

2) Якщо цифри не повторюються, то кожну 3 цифр можна використати лише один раз. Таким чином, кількість можливих чисел буде дорівнювати:

5*4*3*2 = 120

Отже, можна скласти 120 різних чотирицифрових чисел з цифр 02789, якщо цифри не повторюються.

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Помогите, пожалуйста, очень срочно! В скобках это ответы, в каждом вопросе всего один правильный ответ!!! Спасибо заранее

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