(1/2011-1)x(1/2010-1)x(1/2009-1)x···x(1/1002-1)x(1/1001-1)

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(1/2011-1)x(1/2010-1)x(1/2009-1)x···x(1/1002-1)x(1/1001-1)

(1/2011-1)x(1/2010-1)x(1/2009-1)x···x(1/1002-1)x(1/1001-1)
(1/2011-1)x(1/2010-1)x(1/2009-1)x···x(1/1002-1)x(1/1001-1)

(1/2011-1)x(1/2010-1)x(1/2009-1)x···x(1/1002-1)x(1/1001-1)
=-(2010/2011*2009/2010*2008/2009*...*1000/1001)
=-1000/2011