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In a bolt factory, three machines A, B a...

In a bolt factory, three machines A, B and C manufacturers `25`, ` 35` and `40` percent of the total bolts . Of their output `5`, `4` and `2` percent are defective respectively. A bolt is drawn at random and found to be defective. Find the probability that it was manufactured by machine B.

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The correct Answer is:
`(28)/(69)`
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