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SOLVED:(a) The n th partial sum of a geometric sequence an=a r^n-1 is given by Sn= . The series ∑k=1^∞ a r^k-1=a a r a r^2 a r^3 ⋯is an infinite series. If |r|<1, then this series , and its sum is S= . If |r| ≥1, the series .

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