perplexus.info :: Just Math : S.o.d . of s.o.d ,,,

S.o.d . of s.o.d ,,, (Posted on 2012-02-21)

Given a 2011 digit number, divisible by 9.
Let x be the sum of its digits and y the sum of the digits of x.

Find z, sum of the digits of y .

See The Solution Submitted by Ady TZIDON

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