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problem 19 chapter 3 of Rudin. I'm totally lost, I've even done a project on the Cantor set before but I just don't know where to start here.

Associate to each sequence a=(p_n) in which p_n is either 0 or 2, the real number

x(a) = sum from 1 to infinity of (p_n)/(3^n).

Prove that the set of all x(a) is the cantor middle-thirds set.

Cheerio

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# Cantor set defined via sums, whaaaaa?

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