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2014-08-02T16:06:40+03:00
A=(1/1+1/2012) *2012/2=  (2012+1)*1006=2013*1006

b=2/1 + 3/2 +4/3+...+2013/2012

b=(1/1+2013/1)=  2014

b-a= 2014 -2013*1006= 2014 -2 025 078=  -2 023 064