A lot contains 20 articles. The probability that the lot contains exactly two defective articles is 0.4 and the probability that it contains exactly 3 defective articles is 0.6. Articles are drawn from the lot at random one by one without replacement and are tested till all defective articles are found. Then find the probability that the testing procedure ends at the twelfth testing.

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A: Recall:  P(A and B)=P(A∩B)=P(A)×P(B)

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A: Solution

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A:

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Q: ability of getting "six" at

A:

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A: Experiment : Guessing the combination Event: Guessing the right combination.