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The chance of defective screws in three ...

The chance of defective screws in three boxes `A ,B ,Ca r e1//5,1//6,1//7,` respectively. A box is selected at random and a screw draw in from it at random is found to be defective. Then find the probability that it came from box `Adot`

A

`(16)/(29)`

B

`(1)/(15)`

C

`(27)/(59)`

D

`(42)/(107)`

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The correct Answer is:
D
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