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Question Number 30560 by abdo imad last updated on 23/Feb/18
study the roots of f_n (x)= Σ_(k=0) ^n    (x^k /(k!)) .
$${study}\:{the}\:{roots}\:{of}\:{f}_{{n}} \left({x}\right)=\:\sum_{{k}=\mathrm{0}} ^{{n}} \:\:\:\frac{{x}^{{k}} }{{k}!}\:. \\ $$

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