The nth partial sum of the series 2n=1 an is given by Select the correct rule for an or the actual nth term. Hint: an-Sn-Sn-1 O a Ob Oc Od an an an an -5 (n-3)(n-4) 2n²-5 (n-3)(n-4) -5 (n+3)(n+4) 2n²-5 (n + 3) (n + 4) || n

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A: The explanation of the solution as follows:

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