Предмет: Алгебра, автор: alteza94

в ящике 20 одинаковых шаров из них 6 белых 9 чёрных и остальные синие. На удачу выбирается один шар, какое вероятность что этот шар не чёрный.

Ответы

Автор ответа: ЛюбАнянь

число благоприятных исходов на всего. т. е 6 белых 9 черных и 5 синих, 11/20=0,55%

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