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Power Serieseasy
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Given ∑n=0∞cnxn\sum_{n=0}^{\infty} c_n x^n∑n=0∞​cn​xn with radius of convergence RRR, which statement best describes the radius of convergence R′R'R′ of the series ∑n=0∞cnx2n\sum_{n=0}^{\infty} c_n x^{2n}∑n=0∞​cn​x2n?