MathDB
2006 SMT Algebra #10 - Evaluate for |a|<1

Source:

August 24, 2011
ratiogeometric sequence

Problem Statement

Evaluate: ∑k=1∞kak−1\sum^{\infty}_{k=1} \tfrac{k}{a^{k-1}} for all ∣a∣<1|a|<1.
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