SOLUTION: In a batch of 100 CDs 6 are defective. A sample of three Cds is to be selected at random. What is the probability that two of the three Cds will be defective

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Question 1200689: In a batch of 100 CDs 6 are defective. A sample of three Cds is to be selected at random. What is the probability that two of the three Cds will be defective
Answer by ikleyn(52921)   (Show Source): You can put this solution on YOUR website!
.

The number of all possible triples from 100 CDs is  

     =  = 161700.


The number of triples CDs, that contain exactly 2 of 6 defective CDs is 

     = 15*94 = 1410.


The desired probability is the ratio of these numbers

    P =  = 0.00872   (rounded).    ANSWER

Solved.



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