document.write( "Question 669715: In how many ways can a sample (without replacement) of 4 items be selected from a population of 6 items? \n" ); document.write( "
Algebra.Com's Answer #416542 by jim_thompson5910(35256)\"\" \"About 
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C(n,r) = (n!)/(r!(n-r)!)\r
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\n" ); document.write( "\n" ); document.write( "C(6,4) = (6!)/(4!*(6-4)!)\r
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\n" ); document.write( "\n" ); document.write( "C(6,4) = (6!)/(4!*2!)\r
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\n" ); document.write( "\n" ); document.write( "C(6,4) = (6*5*4!)/(4!*2!)\r
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\n" ); document.write( "\n" ); document.write( "C(6,4) = (6*5)/(2!)\r
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\n" ); document.write( "\n" ); document.write( "C(6,4) = (6*5)/(2*1)\r
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\n" ); document.write( "\n" ); document.write( "C(6,4) = (30)/(2)\r
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\n" ); document.write( "\n" ); document.write( "C(6,4) = 15\r
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\n" ); document.write( "\n" ); document.write( "So there are 15 ways.
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