I used the ratio test and after some cancellations, i get not sure if what i got so far is correct but i get stuck after i get to this part. How do i finish this problem? thanks!
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After applying the ratio test, you should get instead of another sigma. To find the radius of convergence, you simply have to find the values of x that would make the series converge.
ahh silly mistake from me. forgot about that. thanks!
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