what is the relation among Sn , Sn-1 and Tn for one mark
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The sum of the first n terms of a series is given by Sn = 4n2 + 5. Find an expression for the n-th term, Tn. One method is to use the relationship: Sn−1 + Tn = Sn ⇒ Tn = Sn − Sn−1 (1) Another method is to obtain the first few terms of the series directly.
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