The sequence about the year 2

Algebra Level 2

\[\frac{1}{2015} \times \frac{1^{3} + 2^{3} + 3^{3} + \ldots + 2013^{3} + 2014^{3} + 2015^{3}}{1 + 2 + 3 + \ldots + 2013 + 2014 + 2015} = ?\]

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