87. Suppose lim an = oo and an+1≥ an > 0 for all n ≥ 1. Which of the following statements must be true? 00 (Α) Σ diverges. n=1 an 80 (B) (-1)"a, converges. n=1 00 (C) Σ- converges. n=1 an (-1)" converges. n=1 an (D) Σ

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