Предмет: Алгебра, автор: Azides

З першого поверху 9 поверхового будинку вирушив ліфт з п'ятьма пасажирам. Скількома способами ці люди можуть вийти з ліфта?

Ответы

Автор ответа: Аноним

Розміщуємо з 8 по 5

$A^5_8= dfrac{8!}{(8-5)!} = dfrac{8!}{3!} =6720$ способами

Якщо поверхи будуть повторюватись, то $8^5$ способами

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