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Problem 1: Given: x[n] = {...,18, 12, 6, 0, 6, 12, 18, 12, 6, 0, 6, 12, 18, ... }, (a) Compute its DTFS expansion (Hint: x[n] has a period= 6). (b) Compute its average power in the time domain. (c) Compute its average power in the frequency domain.

Fig: 1