In Figure E-29 are some descriptions of discrete-time systems in different forms. Answer the following questions about them.



(a) Which of these systems are unstable (including marginally stable)?



(b) Which of these systems have one or more zeros on the unit circle?




(a) Which of these systems are unstable (including marginally-stable)? BDH

(b) Which of these systems have one or more zeros on the unit circle? CDEG

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