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A lot contains 20 articles. The probabil...

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

`99/1000`

B

`97/1000`

C

`93/1000`

D

None of these

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The correct Answer is:
A
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