1.

There are four machines and it is known thatexactly two of them are faulty. They aretested , one by one , in a random order till both the faulty machines areidentified. Then theprobability that only two tests are needed is

Answer»

`(1)/(3)`
`(1)/(6)`
`(1)/(2)`
`(1)/(4)`

Answer :B


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