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Mathematics, 26.03.2021 08:20 scasemere

In a bolt manufacturing factory, machines 4, Band C produce 25%, 30% and 45% of the total output respectively, of their output, 7%, 6% and 4% are defective bolts,
respectively. A bolt is drawn at random from production, what is the probability that it
was found to be non-defective?
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