Question 536871
We have *[tex \LARGE x = \frac{10^{10} - 1}{3}]. Then,


*[tex \LARGE x^2 = (\frac{10^{10} - 1}{3})^2 = \frac{10^{20} - 2*10^{10} + 1}{9}]. Try visualizing what this number would look like if you were to write it out, then find the sum of the digits.


Alternatively, you could find x^2 for x = 34, 334, etc. and try to find a pattern.