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The probability that a contractor will g...

The probability that a contractor will get a plumbing contract is `(2)/(3)` and the probability that he will not get an electric contract is `(5)/(9)`,if the probability getting of at least one contract is `(4)/(5)` then what is the probability that he will get both the contract?

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The correct Answer is:
`(14)/(45)`
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