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В классе количество учеников равно 9. Среди них есть ученик по имени Игорь. Учитель
в течение урока по очереди вызывает к доске двух человек. Сколько элементарных
событий благоприятствуют событию «К доске вышел Игорь»?

Ask by Burton Wells. in Russia
Jan 23,2025

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Количество благоприятных событий равно 16.

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Чтобы узнать, сколько благоприятных элементарных событий для события «К доске вышел Игорь», нужно рассмотреть, сколько пар учеников можно сформировать с Игорем. Если Игорь один из двух вызываемых к доске, то его напарником может быть любой из остальных 8 учеников (потому что в классе всего 9 учеников).
Таким образом, количество элементарных событий, благоприятствующих событию «К доске вышел Игорь», равно 8. Это означает, что существует 8 различных комбинаций, в каждой из которых Игорь выходит к доске с одним из остальных учеников.

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