(1/2012-1)*(1/2011-1)*(1/2010-1)*……*(1/1001-1)*(1/1000-1)

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(1/2012-1)*(1/2011-1)*(1/2010-1)*……*(1/1001-1)*(1/1000-1)(1/2012-1)*(1/2011-1)*(1/2010-1)*……*(1/1001

(1/2012-1)*(1/2011-1)*(1/2010-1)*……*(1/1001-1)*(1/1000-1)
(1/2012-1)*(1/2011-1)*(1/2010-1)*……*(1/1001-1)*(1/1000-1)

(1/2012-1)*(1/2011-1)*(1/2010-1)*……*(1/1001-1)*(1/1000-1)
2004