The sum of the series $1 + \frac{4}{3} + \frac{10}{9} + \frac{28}{27} + \dots$ up to $n$ terms is

  • A
    $\frac{7}{6}n + \frac{1}{6} - \frac{2}{3 \cdot 2^{n-1}}$
  • B
    $\frac{5}{3}n - \frac{7}{6} + \frac{1}{2 \cdot 3^{n-1}}$
  • C
    $n + \frac{1}{2} - \frac{1}{2 \cdot 3^n}$
  • D
    $n - \frac{1}{3} - \frac{1}{3 \cdot 2^{n-1}}$

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For $x \in \mathbb{R}$,let $[x]$ denote the greatest integer $\le x$. Find the sum of the series $\left[ -\frac{1}{3} \right] + \left[ -\frac{1}{3} - \frac{1}{100} \right] + \left[ -\frac{1}{3} - \frac{2}{100} \right] + \dots + \left[ -\frac{1}{3} - \frac{99}{100} \right]$.

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