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Power Serieseasy
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If f(x)=∑anxnf(x) = \sum a_n x^nf(x)=∑an​xn has radius RRR, what is the radius of convergence of ∑an(kx)n\sum a_n (kx)^n∑an​(kx)n for k≠0k \neq 0k=0?