# 17.&nbsp; A Fourier transform pair is given by...

17.  A Fourier transform pair is given by ${2\over3}^nu[n+3] \Leftrightarrow ^{FT}|{{Ae^{-j6\pi f}\over1-({2\over3})e^{-j2\pi f}}}$

where u[n] denotes the unit step sequence. The value of A is _________.