Let Sn = Σa; be the nth partial sum of the series Σ an. Suppose that Sn is given by Sn = 5- 2 i=1 n=1 n² (a) Find S5. (b) Find a₁ + a₂ + a3 + A4 +A5+ a6 + a7. (c) Find as. (d) Find an.

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