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Find the sum to $n$ terms of the series $10+84+ 734 +\dots $

  1. $\frac{9(9^n+1)}{10}+1$
  2. $\frac{9(9^n-1)}{8}+1$
  3. $\frac{9(9^n-1)}{8}+n$
  4. $\frac{9(9^n-1)}{8}+n^2$
in Numerical Ability by (15.7k points)
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