Did you try to compute the sum?
I have this exercise which I'm not sure how to solve.
It says: Consider the series Does exists any value of x for which the series converges to five? ¿and to 1/3?
Well, I've reasoned that if there exists that value, then it must be inside of the radius of convergence for the series. So I've found the radius of convergence:
But now I don't know how to proceed.