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If $$ab \neq 0$$ and $$a * b = \frac{1}{ab} - 1$$, then $$\sum_{k=1}^{2015}\left(\frac{1}{k^2} * k\right) =$$
$$1008 \times 2015$$
$$1007 \times 2015$$
$$1006 \times 2015$$
$$0$$
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