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GATE ECE 2014 Set 4 | Question: 17

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A Fourier transform pair is given by $$\left ( \frac{2}{3} \right ) \: u[n+3] \overset{FT}{\Leftrightarrow} \frac{Ae^{-j6 \pi f}}{1- (\frac{2}{3} ) e^{-j2 \pi f}}$$ where $u[n]$ denotes the unit step sequence. The values of $A$ is ____________

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