Предмет: Математика, автор: fedorovaka12346

В коробке 9 шаров с номерами от одного до девяти . 8 раз проводят испытание : вытаскивают один шар, записывают его номерами и возвращают шар в коробку. Найти вероятность того что на листе с результатами ровно 5 раз встретится цифра 5

Ответы

Автор ответа: ArmLord

Всего вариантов 9⁸ = 43046721
чтобы была только 5 5-ок из 8и выбранных
8!/(5!*3!) * 9³=40824

процент 0,094 %

Автор ответа: Аноним

не правильно

Автор ответа: ArmLord

да ивини, поправлю сейчас

Автор ответа: ArmLord

чтобы была только 5 5-ок из 8и выбранных
8!/(5!*3!) * 8³=23040 => 0,0535 %

Автор ответа: ArmLord

мой ответ был минимум пять питёрок

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