document.write( "Question 1185833: In a shipment of 22 smart phones, three are defective. How many ways can a quality control inspector randomly test six smart phones, of which three are defective? \n" ); document.write( "

Algebra.Com's Answer #816694 by ikleyn(52786) $\"\"$ $\"About$

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\n" ); document.write( "In a shipment of 22 smart phones, three are defective.
\n" ); document.write( "How many ways can a quality control inspector randomly test six smart phones,
\n" ); document.write( "of which three are defective?
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document.write( "They want you calculate the number of different sextuplets (subsets of 6 smartphones)\r\n" );
document.write( "that contain that three defective smartphones.\r\n" );
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document.write( "Then, it is obvious, that the number of such sextuplets is equal to the number of different TRIPLETS\r\n" );
document.write( "that you can select from 22-3 = 19 good smartphones to add them to that unique triple of\r\n" );
document.write( "defective smartphones.\r\n" );
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document.write( "Finally,   =  = 969  is your  ANSWER.\r\n" );
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