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Let $$a_1, a_2, \ldots, a_{2005}$$ be real numbers such that $$\begin{array}{ccccccccccc} a_1\cdot 1 &+ &a_2 \cdot 2 &+& a_3 \cdot 3 &+ &\cdots& + &a_{2005} \cdot 2005 &=& 0 \\ a_1\cdot 1^2 &+& a_2\cdot 2^2 &+& a_3 \cdot 3^2 &+ &\cdots& + & a_{2005} \cdot 2005^2 &=& 0 \\ a_1 \cdot 1^3 &+& a_2 \cdot 2^3 &+& a_3 \cdot 3^3 &+ &\cdots& + & a_{2005} \cdot 2005^3 &=& 0 \\ \vdots&&\vdots&&\vdots&&&&\vdots&&\vdots \\ a_1\cdot 1^{2004} &+& a_2\cdot 2^{2004} &+& a_3\cdot 3^{2004} &+ &\cdots& + &a_{2005} \cdot 2005^{2004} &=& 0 \end{array}$$ and $$\begin{array}{ccccccccccc} a_1 \cdot 1^{2005}& +& a_2\cdot 2^{2005} &+& a_3\cdot 3^{2005} &+ &\cdots& + &a_{2005} \cdot 2005^{2005} &=& 1. \end{array}$$ What is the value of $$a_1$$?

Apr 16, 2019