There are four machines and it is known that exactly two of them are faulty. They are…
Mathematics · JEE Advanced · NTA Exams — Statistics and Probability
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
- 1/3
- 1/6
- 1/2
- 1/4
Answer
(A) 1/3
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