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За круглый стол на 11 стульев в случайном порядке рассаживаются 9 мальчиков и 2 девочки.Найдите вероятность того,что девочки окажутся на соседних местах.
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Предмет:
Алгебра -
Автор:
skinny minnywdkk - 5 лет назад
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Ответы 2
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спасибо большое)
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Автор:
dee dee - 5 лет назад
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0
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Допустим, первая девочка уже села на какое-то место. Вероятность этого события 1. Осталось 11-1=10 мест. Чтобы вторая девочка оказалась рядом с первой, она может сесть либо слева, либо справа от нее. Получаем число благоприятных исходов m=2. Учитывая, что всех возможных исходов n=10, получаем значение искомой вероятности:
Ответ: 0,2.
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Автор:
wilkins - 5 лет назад
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