Without using mathematical tables, evaluate 27^{2/3} x (^{81}/_{16})^{-1/}_{4 }

(3^{3})^{2/3} x (3^{4}/2^{4})^{-1/4} 3^{2}x(2^{4}/3^{4})^{-1/4}=3^{2}x^{2}/_{3 }= 3x2=6

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