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I need help with the following DTFS problems for parts A and B. Thank you

Prob. 2_Discrete-Time Fourier Series (DTFs) (a) A periodic signal, z[n is shown below. Use the analysis equation to determine

(b) Sketch the magnitude spectrum, la vs. k for 100 k 105. Please note each value laJ 100 101 103 104

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Le 6 2 1J 2 a, .ific.o-cea以.о. се叫 그a. bxG+4 bts.To2- 欠D .31-o.e 3 JAR O.Se (o) :0

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