How to calculate 2 + 4 + 6 + 4 + 2012 + 2014

2 + 4 + 6 + 4 + 2012 + 2014 = (2 + 2014) * 1007 / 2 = 1015056

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20. 1x2+2x3+3x4+4x5+.+15x16