मान ज्ञात कीजिए: $\frac{2 \cdot 3^{n+1} + 7 \cdot 3^{n-1}}{3^{n+2} - 2 \cdot (1/3)^{1-n}}$
- A$1$
- B$3$
- C$-1$
- D$0$
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