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JEE Advanced Mathematics question

MathematicsProbabilityJEE Advanced

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

Answer: (B)

Solution

Under the intended reading, both faulty machines must actually be found by the tests. Only two

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Question ID VK-109779