Question: 3.4. In the above problem the tubes are checked by drawing a tube at random, testing it and repeating the process until all 4 bad

3.4. In the above problem the tubes are checked by drawing a tube at random, testing it and repeating the process until all 4 bad tubes are located. What is the probability that the fourth bad tube will be located

(a) on the fifth test?

(b) on the tenth test?

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