Question: 6. Two defective tubes get mixed up with 2 good ones. The tubes are tested, one by one, until both defectives are found. What is

6. Two defective tubes get mixed up with 2 good ones. The tubes are tested, one by one, until both defectives are found. What is the probability that the last defective tube is obtained on (i) the second test, (ii) the third test and (iii) the fourth test

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