Gmurman. Book of problems in the theory of probability. Target 15

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Устройство состоит из пяти элементов, из которых два изношены. При включении устройства включаются случайным образом два элемента. Найти вероятность того, что включатся неизношенные элементы.

Ответ: P(A)=0,3

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