Gmurman. Book of problems in the theory of probability. Task 20

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В группе 12 студентов, среди которых 8 отличников. По списку наудачу отобраны 9 студентов. Найти вероятность того, что среди отобранных студентов пять отличников.

Ответ: P(A)=14/55=0,255

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