Power series convergence (center of the power series)

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Does every power series converge at at least one point? Would this point be the point at which the power series is centered. Also, is there a proof for the above question?

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Yes. If you plug in $x=a$ in your series $$ \sum\limits_{n=0}^\infty c_n(x-a)^n $$ you get a finite value, namely $c_0$.