jee-advanced 1998 Q26

jee-advanced · India Probability Definitions Finite Equally-Likely Probability Computation

26. 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) $1 / 3$
(B) $1 / 6$
(C) $1 / 2$
(D) $1 / 4$

26. 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) $1 / 3$\\
(B) $1 / 6$\\
(C) $1 / 2$\\
(D) $1 / 4$\\

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