There are four machines and it is known ...

There are four machines and it is known that eactly two of them are faulty. They are tested, one by one, in a random order till both the faulty machines are identified. The probability that only two tests are needed is (A) `1/6` (B) `1/3` (C) `1/2` (D) `1/4`

A

`1/3`

B

`1/6`

C

`1/2`

D

`1/4`

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The correct Answer is:

A

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