Question: 3.2. Two defective tubes get mixed up with two good ones. The tubes are tested, one by one, until both defectives are found. (a) What

3.2. Two defective tubes get mixed up with two good ones. The tubes are tested, one by one, until both defectives are found.

(a) What is the probability that the last defective tube is obtained on the second test?

(b) What is the probability that the last defective tube is obtained on the third test?

(c) What is the probability that the last defective tube is obtained on the fourth test?

(d) Add the numbers obtained for (a), (b), and

(c) above.. Is the result surprising?

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