I am getting lost in the proof in the 5th line when it says there are 10 numbers that have the same kth digit as x. Why 10? I don't understand where this number is coming from and it doesn't seem arbitrary.(adsbygoogle = window.adsbygoogle || []).push({});

the rest of the proof

http://i603.photobucket.com/albums/tt113/KtmPayton/0306132314.jpg

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# Lower and Upper bound proof in R

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