Предмет: Алгебра, автор: solbrine2

Теория вероятности.Подробно пожалуйста.

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Автор ответа: Aigul9912

Вероятность - это отношение благоприятных событий ко всем событиям. Найдем числа, кратные 5. До 200 их будет 40 (5, 10, 15...) Теперь кратные 7. До 70 их 10, до 210 - 30. До 200 - 30-2=28 Вычтем числа, которые кратны и 5, и 7, чтобы не повторялись. Это 35, 70, 105, 140, 175. Всего благоприятных событий - 28+40-5=63 Всего событий: 200. Вероятность: 63/200

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