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  1. The z- transform of a systerm is If the ROC is |z| < 0.2, then the impluse response of the system is

    2. A.
    (0.2)n ∪[n]
    B.
    (0.2)n ∪[- n - 1]
    C.
    -(0.2)n ∪[n]
    D.
    -(0.2)n ∪[- n - 1]

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    Answer : Option D

    Explanation :

    ROC is |z| < 0.2, which shows x(n) must be non-causal, therefore sequence must be left handed.

    But given is z-transform of right handed sequence.

    But if H(z) become then ROC become |z| < 0.2 and inverse z-transform of is - (0.2)n ∪(- n - 1).

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