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there are 4 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 are identified.then the probability that only two tests are needed is................ please reply soon..............

there are 4 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 are identified.then the probability that only two tests are needed is................


please reply soon..............

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1 Answers

Mir Noaman Ali IIT-Roorkee
57 Points
11 years ago

ONLY TWO TESTS WILL BE REQUIRED IF WE GET BOTH THE FAULTY MACHINES OR GET BOTH THE NON FAULTY MACHINES SO EACH PROBABLITY IS 2/4 INTO 1/3 DATS 1/6 ND 1/6 AGAIN FOR BOTH CORRECT MACHINES OS ANSR IS 1/6 + 1/6 =1/3

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