13. What is the interval of convergence for the power series f(x) = Σ n=1 (a) [-7,1] (e) [-1,7] (i) {3} (b) (-7,1] (f) (-1,7] (j) (-∞, ∞) (c) [-7, 1) (g) [-1,7) (x - 3)" n n4n+1 (d) (-7,1) (h) (-1,7) (k) None of these

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