A matrix M<sub>r</sub> is defined as <span class="math-tex">\(M_r = \begin{bmatrix} r & r - 1 \\\ r - 1 & r \end{bmatrix} r \in N\)</span>, then the value of det (M<sub>1</sub>) + det(M<sub>2</sub>) + ... + det(M<sub>2015</sub>) is
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