Într-un lot de 2000 de piese, 50 cu defecte remediabile, 20 rebuturi, iar restul...
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Într-un lot de 2000 de piese, 50 cu defecte remediabile, 20 rebuturi, iar restul bune. Se iau la întâmplare 30 de piese. Care e probabilitatea ca dintre acestea 15 să fie bune, 6 remediabile, 9 rebuturi?
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