i'm going through a proof and i cant seem to workout why this equality makes sense(adsbygoogle = window.adsbygoogle || []).push({});

[tex] \sum^{10^{i}-1}_{k=0} \frac{k}{10^i} = \frac{(10^i-1)}{2}[/tex]

this may be obvious, any hints atleast would be much appreciated

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# Infinite series

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