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[" A lot contains "20" articles.The probability that the lot contains exactly "2" defective "],[" articles is "0.4&" the probability that the lot 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.The probability that the testing procedure "],[" ends at the twelfth testing "]

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A lot contains 20 articles. The probability that the lot contains exactly 2 defective articles is 0.4 and the probability thatthe lot contains exactly 3 defective articles is 0.6. Articles are drawn in random one by one without replacement andtested till all the defective articles are found. What is the probability that the testing procedure ends at the twelfth testing ?

A lot contains 20 articles. The probability that the lot contains exactly 2 defective articles is 0.4 and the probability thatthe lot contains exactly 3 defective articles is 0.6. Articles are drawn in random one by one without replacement andtested till all the defective articles are found. What is the probability that the testing procedure ends at the twelfth testing ?

A lot contains 20 articles. The probability that the lot contains exactly 2 defective articles is 0.4 and the probability thatthe lot contains exactly 3 defective articles is 0.6. Articles are drawn in random one by one without replacement andtested till all the defective articles are found. What is the probability that the testing procedure ends at the twelfth testing ?

Two items are chosen a lot containing 10 items of which 3 are defective,then the probability that at least one of them is defective:

A box contains 50 articles of which 4 are defective. One article is taken at random from the box. Find the probability of that article is not defective. .