Determine the limit of the series, or state that the series diverges. Show the reason to support your answer. 3п + 27 ( a) Σ 4n n=2 n2 +1 b) Σ-1-1, 2n2 +n – 1 n=2 3 (c) (3n – 1)(3n +2) Hint: Use partial fractions and telescoping method. - n=1

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A: Step 1: expansion of series  Step 2: checking the value of r Step 3: r>1  Step 4: divergence

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