A6. Let 1 an be a series. (a) State precisely what is meant by the phrase "-1 an converges". (b) State precisely what is meant by the phrase "1 an converges absolutely". (c) Determine which of the following series converge absolutely. Briefly explain your answer. (i) Σ1(−1)"}. (ii) Σ1(−1)″ n²+1° (iii) Σ1(−1)n-1, -1 3n n!+1*

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