document.write( "Question 1200775: 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 \n" ); document.write( "

Algebra.Com's Answer #834985 by ikleyn(52925) $\"\"$ $\"About$

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\n" ); document.write( "In a batch of 100 CDs 6 are defective. A sample of three CDs is to be selected at random.
\n" ); document.write( "What is the probability that two of the three CDs will be defective
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document.write( "The number of all possible triples of 100 CDs is\r\n" );
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document.write( "     =  = 161700.\r\n" );
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document.write( "The number of all triples, that contain 2 defective CDs of 6 defective CDs is\r\n" );
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document.write( "     =  =  = 15*94 = 1410.\r\n" );
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document.write( "The desired probability is the ratio of these two numbers\r\n" );
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document.write( "    P =  =  = 0.00872  (rounded).    ANSWER\r\n" );
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