document.write( "Question 919004: Evaluate the given expression:
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Algebra.Com's Answer #557409 by Edwin McCravy(20055) $\"\"$ $\"About$

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document.write( "1.  The identity C(A,B) = C(A,A-B)\r\n" );
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document.write( "and\r\n" );
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document.write( "2. C(A,B) = \r\n" );
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document.write( "C(n,n-2) = C(n,n-(n-2)) = C(n,n-n+2) = C(n,2) =  = \r\n" );
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document.write( "Edwin

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