Define the double factorial of n, denoted n!!, as follows: S1.3.5 | 2.4.6 -(п — 2) п -(п — 2) 3 if n is odd n!! if n is even where (-1)! = 0!! = 1. %3D Find the radius of convergence for the given power series. 9" . n! · (3n + 5)! - (2n)!! :(-2x – 5)" 8" - [(n + 8)!]3 - (4n – 3)! The radius of convergence, R =

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