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Из партии 1000 ламп 340 принадлежат к 1 партии, 280 – ко второй партии, остальные к третьей. В первой партии 6 % брака, во второй – 5 %, в третьей – 4 %. Наудачу выбирается одна лампа. Определить вероятность того, что выбранная лампа – бракованная.
