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2014-09-25T09:53:53+03:00
X(1 + 2 + 3 + ..... + 2015) = 1 + 2 + 3 ... + 2014
x * 2015 * (1 + 2015) : 2 = (1 + 2014) * 2014 : 2
2015x * 1008 = 2015 * 1007
x = 2015 * 1007
     2015 * 1008
x = 1007 = 0,9990079
      1008 
2 3 2