Question:If ` (9^n (3^2) (3^(-n/2))^ (- 2) - 27^n)/(3^3m (2^3))= 1/27,` then 

A m - n = 2 
B m - n = 1 
C m - n = -2 
D m - n = -1 

+ Answer
B 

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Irin Moni

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