Предмет: Математика, автор: Koolll23

У коробці 5 білих і 4 чорних кульки. З коробки навмання витягують одну за одною дві кульки і в коробку не повертають. Знайти ймовірність того, що друга кулька біла, якщо преша кулька: 1) біла; 2) чорна

Ответы

Автор ответа: Аноним

1) (5-1)/(5-1+4)=0,5

2) 5/(5+4-1)=0,625

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