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  1. If\(\frac{9^{n}(3^{2})(3^{\frac{- n}{2}})^{- 2}-27^{n}}{3^{3m}(2^{3})} = \frac{1}{27} \), then

Options:
A .  m + n +1
B .  m – n = 1
C .  n + m= – 1 
D .  n – m = 1
Answer: Option B

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