Consider the series (-7)k–1 k3 · k! S = k=1 Let L be the limit referred to in the ratio (quotient or D'Lambert) criterion. By analyzing the nature of S by such criterion, it is concluded that the series: a) diverges, since L = 7. b) converges, since L 1/7. c) converges, since L 0. d) diverges, since L = %3D

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