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Question 1
A matrix $M_r$ is defined as $M_r=\begin{bmatrix} r &r-1 \\ r-1&r \end{bmatrix} , r \in N$ then the value of $det(M_1) + det(M_2) +...+ det(M_{2015})$ is
A.
$2014^{2}$
B.
$2013^{2}$
C.
$2014$
D.
$2015^{2}$
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