$ \lim_{n \to \infty} \frac{3 \cdot 2^n + 4 \cdot 5^n + 15 \cdot 2^n + 7.5^n}{7.5^n} = $

Question

$ \frac{3}{5} $

$ \frac{-4}{7} $

$ \frac{-20}{7} $

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