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Our approach is to write T as a geometric series in terms of S and r.

Give a closed form expression for T in terms of r.

Let,

\(|r| < 1,  S = \sum_{k=0}^{\infty} r^k,   T = \sum_{k=0}^{\infty} k r^k. \)

amandapaolars  Mar 20, 2018
edited by Guest  Mar 20, 2018
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Can you translate it into "plaintext"??

Guest Mar 20, 2018
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help please

amandapaolars  Mar 21, 2018

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