7.24 Consider the finite-duration signal

x(n) = {1,2,3,1}

(a) Compute its four point DFT by solving explicitly the 4-by-4 system of linear equations defined by the inverse DFT formula.
(b) Check the answer in part (a) by computing the four-point DFT, using its defination.
in Solution Manual for Digital Signal Processing by John Proakis by

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Handwritten Solution for Problem Number 7.24 from Digital Signal Processing 4th edition By John G. Proakis

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