n +4 The nth partial sum of the series En=1 an is given by n n - 5. Select the correct rule for a,or the actual nth term. Hint: a, = Sn- Sn - 1 a an (п - 5) (п - 6) b -9 an = (n – 5)(n – 6) -5 an (п - 5)(п - 6) 2n2 -9 an (п - 5) (п - 6)

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