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The polynomial $1-x+{x}^{2}-{x}^{3}+.....-{x}^{17}$

may be written in the form ${a}_{0}+{a}_{1}y+{a}_{2}{y}^{2}.....+{a}_{17}{y}^{17}$

$where \quad y=x+1$ and ${a}_{i}s$ are constant then find ${a}_{2}$

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