Let x[n] be a real-valued, causal, finite-length sequence with length N = 3.Find two cho...

Let x[n] be a real-valued, causal, finite-length sequence with length N = 3.Find two choices for x[n] such that the real part of the DFT X_R[k] matches that shown in Figure P12.18.

Note that only one of your sequences is “periodically causal” according to the definition in Section 10.2, where x[n] = 0 for N/2 < n ≤ N − 1.