Tính \( D = 1 + \frac{2}{3} + \left( \frac{2}{3} \right)^2 + \left( \frac{2}{3} \right)^3 + \ldots + \left( \frac{2}{3} \right)^{50} \)

Giải
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g) \( D = 1 + \frac{2}{3} + \left( \frac{2}{3} \right)^2 + \left( \frac{2}{3} \right)^3 + \ldots + \left( \frac{2}{3} \right)^{50} \)