Let $a_k$ be a sequence of pairwise distinct positive integers. Prove that
$\sum\limits_{i=1}^{n} \dfrac{a_k}{k^2}$ $ \sum\limits_{i=1}^{n} \dfrac{1}{k} $
Edited by math_galois, 14-01-2008 - 22:07.
Edited by math_galois, 14-01-2008 - 22:07.
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