document.write( "Question 481833: Evaluate each factorial expression.\r
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Algebra.Com's Answer #329894 by Alan3354(69443)\"\" \"About 
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20!/18! = 20*19*18!/18! = 20*19 See that? All other terms cancel.
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\n" ); document.write( "20!/2!18! = 20*19/2 = 190
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