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  • 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 onl

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 will be required is

Option: 1

\frac{1}{3}


Option: 2

\frac{1}{6}


Option: 3

\frac{1}{2}


Option: 4

\frac{1}{4}


Answers (1)

best_answer

The required probability = (probability of the first being faulty) X (probability of the second being faulty when the first is faulty)

=\frac{2}{4} \times \frac{1}{3}=\frac{1}{6}

Posted by

Shailly goel

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