There are four machines and it is known that exactly two of them are faulty. They are…
Mathematics · JEE Main · 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
- \(\frac{1}{3}\)
- \(\frac{1}{6}\)
- \(\frac{1}{2}\)
- \(\frac{1}{4}\)
Answer
(A) 1 3
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