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\text { A series is defined by } S_{n}=\sum_{r=1}^{n}(4 r-2) (а)Find the first 4 terms of the series \text { (b) Use the method of induction to prove that }

S_{n}=2 n^{2} \text { (c) Find the sum of the first } 20 \text { terms of the series. }

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