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27 August, 08:35

Suppose the series Σ cn xn has radius of convergence 2 and the series Σ dn xn has radius of convergence 3. What is the radius of convergence of the series Σ (cn + dn) xn?

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  1. 27 August, 10:12
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    I normally don't do these things but I believe the answer is sn2x • (c + d).
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