With one method of a procedure called acceptance sampling, a sample of items is randomly selected without replacement and the entire batch is accepted if every item in the sample is okay. A company just manufactured 1004 CD's, and 194 are defective. If 9 of these CDs are randomly selected for testing, what is the probability that the entire batch will be accepted?

Question

anonymous · Answer

the probability of getting an OK cd for the first time is 1/(1004-194)

anonymous · Answer

but the probability of getting as OK cd for the second time is the product of the probability for the first one and 1/(1003-194). {its 1003 because one cd got taken away}

anonymous · Answer

so the equation would look like this 
$$1/((1004-194)*(1003-194)*(1002-194)*(1001-194)*(1000-194*...)$$

anonymous · Answer

@Doman I GET WHERE YOU ARE GOING WITH THIS BUT WHEN I SUBMIT MY ANSWER, IT IS INCORRECT AND IT SAYS THE ANSWER IS .145
AND I DONT UNDERSTAND HOW THEY ARE GETTING THESE ANSWERS