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There are four machines and it is known ...

There are four machines and it is known that exactly two of them are faulty. They are tested , one by one , in a random order till both the faulty machines are identified. Then the probability that only two tests are needed is

A

1) `(1)/(3)`

B

2) `(1)/(6)`

C

3) `(1)/(2)`

D

4) `(1)/(4)`

Text Solution

Verified by Experts

The correct Answer is:
B
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